Transportation Research Thesaurus (TRT)

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19th	19th century (Weaf)
2000	Year 2000 date conversion (Xbkmqx)
20th	20th century (Weag)
21st	21st century (Weah)
55	55 mph speed limit (Crftrsa)
65	65 mph speed limit (Crftrsb)
80	HY 80 steel (Rbmdkdfsccmh)
85th	85th percentile speed (Bthsmp)
Abandonment	Abandonment (Cqcb)
Abatement	Noise abatement USE Noise control (Jfny)
Abdomen	Abdomen (Myk)
Abilities	Abilities (Mxr)
Ability	Ability tests (Mxra)
Ablative	Ablative materials (Rbmuvtb)
Aboard	Crimes aboard aircraft (Huted)
	Crimes aboard buses (Hutef)
	Crimes aboard public vehicles (Hute)
Abrasion	Abrasion (Smdjb)
	Abrasion resistance (Rkmjb)
	Abrasion resistant coatings (Rbmnfcb)
	Abrasion tests (Gbkb)
Abrasions	Abrasions (Hjpbb)
Abrasive	Abrasive blasting USE Blast cleaning (Fmbbc)
Abrasives	Abrasives (Rbmnb)
ABS	ABS USE Antilock brake systems (Qpkbe)
Absenteeism	Absenteeism (Ccbra)
Absorbents	Absorbents (Rbmnxe)
Absorbers	Absorbers (Materials) USE Absorbents (Rbmnxe)
	Shock absorbers (Qpiyn)
Absorbing	Energy absorbing materials (Rbmnie)
Absorption	Absorption (Srhd)
	Absorption spectra (Srpb)
	Absorption spectroscopy (Gmcesb)
	Acoustic absorption USE Sound absorption (Sbts)
	Energy absorption (Smefe)
	Energy absorption (Srhde)
	Sound absorption (Sbts)
Absorptivity	Absorptivity (Rkrb)
Abstracts	Abstracts (Xbbx)
Abuse	Alcohol abuse (Hmdsb)
	Drug abuse (Hmdqb)
Abutments	Abutments (Pbpbfb)
	Bridge abutments (Pdybbfb)
Accelerated	Accelerated tests (Gbpd)
	Accelerated weathering (Jbyyc)
Accelerating	Accelerating agents (Rbmdhcjf)
	Accelerating potential (Sea)
Acceleration	Acceleration (Mechanics) (Smdpb)
	Acceleration lanes (Pmrcpmtb)
	Angular acceleration (Smdpvcc)
	Lateral acceleration (Smdpbm)
Accelerators	Accelerators (Concrete) USE Accelerating agents (Rbmdhcjf)
	Accelerators (Devices) (Qpnyfb)
	Accelerators (Materials) (Rbcta)
Accelerographs	Accelerographs (Gumpab)
Accelerometers	Accelerometers (Gumpa)
Acceptance	Acceptance (Mxpda)
	Acceptance sampling (Gtc)
	Acceptance tests (Gbjb)
	Gap acceptance (Bthg)
Access	Access (Bkq)
	Access control (Communications) (Dsbdmc)
	Access control (Transportation) (Cqea)
	Access for the physically handicapped USE Barrier free design (Esuh)
	Access management (highways) USE Access control (Transportation) (Cqea)
	Access roads (Pmrccnb)
	Access to airports USE Airport access (Bmkha)
	Airport access (Bmkha)
	Carrier sense multiple access (Dsbdmcc)
	Code division multiple access (Dsbdmcg)
	Controlled access highways USE Freeways (Pmrccdf)
	Demand assigned multiple access (Dsbdmcn)
	Frequency division multiple access (Dsbdmcr)
	Limited access highways USE Expressways (Pmrccde)
	Multi access systems (Dsbdm)
	Multiple access systems USE Multi access systems (Dsbdm)
	Random access memory (Qtpxmpbdp)
	Sewer access holes USE Manholes (Pmhpdq)
	Time division multiple access (Dsbdmcu)
	Utility access holes USE Manholes (Pmhpdq)
Accessibility	Accessibility (Bkqf)
Accessorial	Accessorial services (Bdbe)
Accessories	Antenna accessories (Dsgmc)
	Vehicle accessories (Qpy)
Accident	Accident analysis (Hbw)
	Accident black spots USE Accident prone locations (Hbkga)
	Accident causes (Hbc)
	Accident characteristics (Hbk)
	Accident data (Hbxx)
	Accident diagrams (Hbxrd)
	Accident exposure (Hbchr)
	Accident factors USE Accident causes (Hbc)
	Accident frequency USE Accident rates (Hbxxs)
	Accident investigation (Hbx)
	Accident investigation sites (Hbxbb)
	Accident locations (Hbkg)
	Accident prone drivers (Mtghdfca)
	Accident prone locations (Hbkga)
	Accident proneness (Hbchp)
	Accident rates (Hbxxs)
	Accident reconstruction (Hbxr)
	Accident records (Hbxxr)
	Accident reports (Hbxxrr)
	Accident responsibility USE Accident causes (Hbc)
	Accident risk forecasting (Hbxxsv)
	Accident severity (Hbkd)
	Accident survivability USE Survival (Hbpps)
	Accident survival time (Hbppst)
	Accident types (Hbb)
	Accident victims (Mswva)
	Aircraft accident victims (Mswvab)
	High accident locations USE Accident prone locations (Hbkga)
	On the scene accident investigation (Hbxb)
	Traffic accident victims (Mswvat)
	Trilevel accident investigation (Hbxxk)
Accidents	Accidents (Hb)
	Aircraft accidents (Hbba)
	Airline accidents USE Aircraft accidents (Hbba)
	Aviation accidents USE Aircraft accidents (Hbba)
	Bicycle accidents (Hbbgb)
	Bus accidents (Hbbgc)
	Car truck accidents USE Multiple vehicle accidents (Hbbgtb)
	Daytime accidents (Hbktd)
	Fatal accidents USE Fatalities (Hjhx)
	Ground transportation accidents (Hbbg)
	Groundings (Maritime accidents) (Hbbmd)
	Highway accidents USE Traffic accidents (Hbbgt)
	Hit and run accidents (Hbbgtah)
	Human factors in accidents (Hbch)
	Industrial accidents (Hbbs)
	Marine accidents USE Maritime accidents (Hbbm)
	Maritime accidents (Hbbm)
	Moped accidents (Hbbgk)
	Motorcycle accidents (Hbbgm)
	Multiple car accidents USE Multiple vehicle accidents (Hbbgtb)
	Multiple vehicle accidents (Hbbgtb)
	Nighttime accidents (Hbktn)
	Occupational accidents USE Industrial accidents (Hbbs)
	Pedestrian accidents (Hbbgp)
	Railroad accidents (Hbbgr)
	Ran off road accidents (Hbbgtaj)
	Reconstruction of accidents USE Accident reconstruction (Hbxr)
	Roadway departure accidents USE Ran off road accidents (Hbbgtaj)
	Sideswiping accidents USE Side collisions (Hbbgtcs)
	Single vehicle accidents (Hbbgta)
	Time of accidents (Hbkt)
	Traffic accidents (Hbbgt)
	Transit accidents (Hbbgw)
	Truck accidents (Hbbgu)
	Vehicle factors in accidents (Hbcv)
	Workplace accidents USE Industrial accidents (Hbbs)
Accommodation	Crew accommodation (Ccbkp)
Accounting	Accounting (Cg)
	Automated accounting equipment (Dcmcr)
	Cost accounting (Cgc)
Accretion	Ice accretion USE Icing (Jbhyjjs)
Accumulators	Accumulators (Electricity) USE Storage batteries (Qtpfbs)
	Hydraulic accumulators (Qtpfh)
Accuracy	Accuracy (Gmsh)
Acetate	Calcium magnesium acetate (Rbcgrrf)
	Calcium magnesium acetate (Rbmnjf)
	Polyvinyl acetate (Rbcgrrt)
	Uranium acetate USE Uranyl acetate (Rbcgnzm)
	Uranyl acetate (Rbcgnzm)
Acetates	Acetates (Rbcgrbb)
Acetic	Acetic acid (Rbcgrrb)
ACI	ACI USE Automatic car identification (Dmbyb)
Acid	Acetic acid (Rbcgrrb)
	Acid brittleness (Rkmlbeb)
	Acid rain (Jfgsb)
	Acid soils (Rbespbb)
	Carbolic acid USE Phenol (Rbcgrro)
	Ethanolic acid USE Acetic acid (Rbcgrrb)
	Hydrochloric acid (Rbcgnkh)
	Lead acid batteries (Qtpfbbj)
	Muriatic acid USE Hydrochloric acid (Rbcgnkh)
	Nitric acid (Rbcgnrm)
	Phenylic acid USE Phenol (Rbcgrro)
	Phosphoric acid (Rbcgnsp)
	Sulfuric acid (Rbcgnyt)
Acidity	Acidity (Rkcpf)
Acids	Acids (Rbctrb)
Acoustic	Acoustic absorption USE Sound absorption (Sbts)
	Acoustic attenuation USE Sound attenuation (Sbt)
	Acoustic detectors (Dmgdeb)
	Acoustic ducts (Pbpbdcb)
	Acoustic emission (Sbb)
	Acoustic emission method USE Acoustic emission tests (Gbhb)
	Acoustic emission tests (Gbhb)
	Acoustic equipment (Qtba)
	Acoustic generators (Qtbab)
	Acoustic impedance (Rkbf)
	Acoustic insulation USE Damping (Engineering) (Fcdd)
	Acoustic materials (Rbmntb)
	Acoustic measuring instruments (Gumeb)
	Acoustic navigation USE Sonic navigation (Dcnsbu)
	Acoustic properties (Rkb)
	Acoustic radiation (Sbhr)
	Acoustic scattering (Sbf)
	Acoustic signal processing (Dsmmrb)
	Acoustic signature (Rkbj)
	Acoustic velocity USE Speed of sound (Sbw)
	Acoustic waves (Sbh)
Acoustics	Acoustics (Tpxc)
	Pitch (Acoustics) (Sbr)
Acquisition	Knowledge acquisition (Expert systems) (Ubmgcek)
	Property acquisition (Cqa)
Acquisitions	Mergers and acquisitions (Cym)
Acrylic	Acrylic resins (Rbmdqrb)
Actinides	Actinides (Rbcefm)
Action	Affirmative action (Kktfb)
	Capillary action USE Capillarity (Src)
	Community action programs (Kwc)
	Deterioration by environmental action (Jby)
	Frost action (Jbgph)
	Legal action (Csma)
	Materials by strength or resistance to chemical action (Rbmdys)
	Pozzolanic action (Sccyp)
	Soils by chemical content or action (Rbespb)
Actions	Intentional polluting actions (Jfgt)
Activation	Activation (Chemistry) (Scpa)
	Activation analysis (Gbcca)
	Neutron activation analysis (Gbccan)
Active	Active automotive suspensions USE Active suspension systems (Qpib)
	Active grade crossing warning systems USE Grade crossing protection systems (Dcmthcg)
	Active suspension systems (Dcmvgtb)
	Active suspension systems (Qpib)
	Surface active agents (Rbmnns)
Activities	Activities leading to information generation (Xk)
	Geological activities and processes (Jbgp)
Activity	Activity centers (Pfb)
	Activity choices (Bmmw)
	Biological activity (Jd)
	Living things detrimental to human activity (Jcmp)
	Major activity centers USE Activity centers (Pfb)
	Plant activity (Jdx)
	Surface activity USE Surface phenomena (Sr)
Actuated	Actuated traffic signal controllers (Dcmthrrcb)
	Full traffic actuated controllers (Dcmthrrcbtf)
	Pedestrian actuated controllers (Dcmthrrcbp)
	Semi traffic actuated controllers (Dcmthrrcbts)
	Traffic actuated controllers (Dcmthrrcbt)
	Traffic actuated detectors USE Vehicle detectors (Dmgdrv)
	Vehicle actuated signals USE Traffic actuated controllers (Dcmthrrcbt)
Actuating	Actuating systems (Dcga)
Actuation	Full actuation operation USE Full traffic actuated controllers (Dcmthrrcbtf)
Actuators	Actuators (Dcja)
Adaptation	Adaptation (Psychology) (Mxku)
	Adaptation and use of bituminous materials (Fcbyd)
	Adaptation and use of specific materials (Fcby)
	Dark adaptation (Mxbvh)
	Intelligent speed adaptation (Dcmvgmsi)
	Materials adaptation and use (Fcb)
Adaptive	Adaptive control (Dcgb)
	Adaptive systems USE Adaptive control (Dcgb)
Addiction	Drug addiction (Hmdqc)
Additives	Additives (Rbctma)
	Antistrip additives (Rbmndbc)
	Asphalt additives (Rbmdpby)
	Cement additives (Rbmdfcy)
	Fuel additives (Rbfcb)
	Oil additives (Rbmdykr)
Address	Discrete address beacon system USE Mode S (Dcmtbfm)
	Public address systems (Qtbap)
Adhesion	Adhesion (Smub)
Adhesive	Adhesive bonding USE Adhesion (Smub)
	Adhesive strength (Rkmaa)
	Adhesive tape (Rbmnda)
Adhesives	Adhesives (Rbmnd)
	Tape (Adhesives) USE Adhesive tape (Rbmnda)
Adiabatic	Adiabatic conditions (Rkta)
ADIS	ADIS USE Advanced driver information systems (Dtvmnd)
Adjudication	Adjudication (Csi)
Adjusting	Self adjusting systems USE Self organizing systems (Dcgbs)
Adjustment	Adjustment (Psychology) (Mxpdd)
	Adjustment factors (Btec)
	Currency adjustment factor (Ctfr)
Administration	Administration (Caa)
	Business administration (Tgh)
	Contract administration (Cu)
	Customs administration (Ctfuc)
	Public administration (Caaa)
Administrative	Administrative and managerial personnel (Msa)
	Administrative organization USE Administration (Caa)
	Administrative personnel (Msaa)
	Administrative procedures (Crm)
Admiralty	Admiralty law USE Maritime law (Crdm)
Admixtures	Admixtures (Rbmdhcm)
	Concrete admixtures USE Admixtures (Rbmdhcm)
Adolescents	Adolescents (Mbf)
Adopt	Adopt a highway programs USE Adopt-a-highway programs (Kwh)
Adopt-a-highway	Adopt-a-highway programs (Kwh)
ADSEL	ADSEL USE Mode S (Dcmtbfm)
Adsorbents	Adsorbents (Rbmnxg)
Adsorption	Adsorption (Srhk)
Adults	Adults (Mbp)
	Young adults (Mbpc)
Advanced	Advanced automation system (Air traffic control) (Dcmtbc)
	Advanced Driver Assistance Systems USE Driver support systems (Dcmvgycd)
	Advanced driver information systems (Dsfpdb)
	Advanced driver information systems (Dtvmnd)
	Advanced public transportation systems (Dtvbc)
	Advanced rural transportation systems (Dtvbf)
	Advanced technology USE Technological innovations (Eyt)
	Advanced traffic management systems (Dtvmj)
	Advanced train control systems USE Positive train control (Dcmvgyfy)
	Advanced transport telematics USE Intelligent transportation systems (Dtv)
	Advanced traveler information systems (Dsfpb)
	Advanced vehicle control systems (Dcmvgyc)
	Advanced vehicle control systems (Dtvmr)
	ARTS (Advanced rural transportation systems) USE Advanced rural transportation systems (Dtvbf)
Adverse	Adverse conditions USE Weather conditions (Jbmwbb)
Advertising	Advertising (Chq)
	Advertising campaigns (Chqq)
	Outdoor advertising USE Roadside advertising (Chqr)
	Roadside advertising (Chqr)
Advisory	Advisory groups (Msya)
	Highway advisory radio (Dsfpdh)
	In vehicle advisory USE Driver information systems (Dsfpd)
Advocacy	Advocacy groups (Msyb)
AEI	AEI USE Automatic equipment identification (Dmbye)
Aeolotropic	Aeolotropic materials USE Anisotropic materials (Rbmdybb)
Aeolotropy	Aeolotropy USE Anisotropy (Physics) (Rkpjb)
Aeration	Aeration (Fcba)
Aerial	Aerial application (Fmukpa)
	Aerial photogrammetry (Esmsfjb)
	Aerial photography (Esmgpb)
	Aerial reconnaissance (Xkyc)
	Aerial spraying and dusting USE Aerial application (Fmukpa)
	Aerial surveying (Esmsfb)
	Aerial tramways (Pbcud)
Aerodromes	Aerodromes USE Airports (Pmfc)
Aerodynamic	Aerodynamic drag USE Drag (Smdfd)
	Aerodynamic features (Vehicle body components) (Qpbcj)
	Aerodynamic force (Smima)
	Aerodynamic lift (Qdbdb)
	Aerodynamic lift (Smimam)
	Aerodynamic loads USE Aerodynamic force (Smima)
	Aerodynamic noise (Sbhd)
	Aerodynamic stability (Qdbde)
Aerodynamics	Aerodynamics (Smdfb)
Aerofoils	Aerofoils USE Airfoils (Qpbbbk)
Aeronautical	Aeronautical charts (Dcnsjb)
	Aeronautical engineering (Ttkbb)
	Aeronautical facilities USE Air transportation facilities (Pmf)
	Aeronautical instruments USE Aircraft navigational aids (Dcnsyb)
Aeronautics	Aeronautics (Tpxsfb)
	Airspace (Aeronautics) (Jbmbayb)
	Navigation (Aeronautics) USE Aircraft pilotage (Dcnbscb)
	Trim (Aeronautics) (Qdbdu)
Aerosols	Aerosols (Rbctmsb)
Aerospace	Aerospace engineering (Ttkb)
	Aerospace industry (Ncef)
	Aerospace materials (Rbmumttb)
Aerostatics	Aerostatics (Smue)
Aesthetics	Aesthetics (Tcpb)
Affairs	Consumer affairs USE Consumer protection (Crfm)
Affected	Geologically affected surfaces (Jbgy)
	Heat affected zone (Metals) (Rbmdkbbh)
Affirmative	Affirmative action (Kktfb)
Afterburners	Afterburners (Qpwyb)
Afternoon	Afternoon (Wegn)
Against	Protection against environmental damage (Fccm)
Age	Age (Mxbx)
	Age groups (Mb)
	Age hardening (Fcbyjqb)
	Legal drinking age (Hmdsa)
Aged	Aged (Mbpe)
	Aged drivers (Mtghdfcu)
Ageing	Ageing (Biology) USE Aging (Biology) (Jdb)
	Ageing (Materials) USE Aging (Materials) (Pteb)
Agencies	Federal government agencies (Ngga)
	Government agencies (Ngg)
	Human service agencies USE Social service agencies (Nds)
	Local government agencies (Nggk)
	Service agencies (Nd)
	Ship agencies (Nbcs)
	Social service agencies (Nds)
	State government agencies (Nggb)
	Transit operating agencies (Nbbcu)
Agents	Accelerating agents (Rbmdhcjf)
	Air entraining agents (Rbmdhcjc)
	Autonomous agents USE Intelligent agents (Xbkdbj)
	Chemical deicing agents USE Deicing chemicals (Rbmnj)
	Cleaning agents USE Cleansers (Rbmne)
	Curing agents (Rbmdhcjj)
	Curing and setting agents (Rbmdhcj)
	Fire extinguishing agents (Rbmnme)
	Flocculating agents (Rbctg)
	Flotation agents (Rbcth)
	Foaming agents (Rbmdyhff)
	Intelligent agents (Xbkdbj)
	Oxidizing agents (Rbctp)
	Psychotropic agents (Hpgmp)
	Surface active agents (Rbmnns)
	Toxic agents USE Poisons (Rbmdsp)
	Travel agents (Nbdd)
	Water reducing agents (Rbmdhcjw)
	Wetting agents (Rbcty)
Aggregate	Aggregate gradation (Gbbmbc)
	Aggregate mixtures (Rbmddcs)
	Aggregate tests (Gbbmb)
	Alkali aggregate reactions (Sccyb)
	Cement aggregate reactions USE Alkali aggregate reactions (Sccyb)
Aggregates	Aggregates (Rbmddc)
	Aggregates by gradation (Rbmddcf)
	Aggregates by relationship to concrete (Rbmddcm)
	Aggregates by shape and surface texture (Rbmddcj)
	Aggregates by source (Rbmddcc)
	Aggregates by treatment (Rbmddcp)
	Aggregates, rock and stone (Rbmdd)
	Artificial aggregates (Rbmddccb)
	Basalt coarse aggregates (Rbmddccnb)
	Bituminous aggregates (Rbmddcsb)
	Calcined aggregates (Rbmddcpc)
	Coarse aggregates (Rbmddcjc)
	Concrete aggregates (Rbmddcsc)
	Consolidated aggregates, rock and stone (Rbmddv)
	Continuously graded aggregates (Rbmddcfc)
	Crushed aggregates (Rbmddcpf)
	Crusher run aggregates (Rbmddcpj)
	Dense graded aggregates (Rbmddcfd)
	Expanded clay aggregates (Rbmddccbe)
	Expanded shale aggregates (Rbmddccbg)
	Fine aggregates (Rbmddcjf)
	Gap graded aggregates (Rbmddcfg)
	Gradation (Aggregates) USE Aggregate gradation (Gbbmbc)
	Graded coarse aggregates USE Coarse aggregates (Rbmddcjc)
	Graded fine aggregates USE Fine aggregates (Rbmddcjf)
	Interlocking aggregates (Rbmddcjj)
	Lightweight aggregates (Rbmddccbm)
	Limestone aggregates (Rbmddccnm)
	Manufactured aggregates USE Artificial aggregates (Rbmddccb)
	Mineral aggregates (Rbmddccnn)
	Natural aggregates (Rbmddccn)
	Open graded aggregates (Rbmddcfp)
	Polishing (Aggregates) (Smdrs)
	Precoated aggregates (Rbmddcpp)
	Reactive aggregates (Rbmddcmr)
	Rounded aggregates (Rbmddcjr)
	Segregation (Aggregates) (Smfr)
	Slag coarse aggregates (Rbmddccbs)
	Soil aggregates (Rbmddcss)
	Synthetic aggregates USE Artificial aggregates (Rbmddccb)
	Volcanic aggregates (Rbmddccnv)
Aggregation	Aggregation USE Cluster analysis (Usjb)
	Aggregation (Chemistry) (Scpb)
Aggression	Aggression (Mxqa)
Aggressive	Aggressive waters (Jbha)
Aggressiveness	Aggressiveness (Psychology) USE Aggression (Mxqa)
Aging	Aging (Biology) (Jdb)
	Aging (Materials) (Pteb)
Agreements	Labor agreements (Kabkrp)
Agricultural	Agricultural aviation (Ncegga)
	Agricultural chemicals (Rbmumtc)
	Agricultural economics (Tgmb)
	Agricultural equipment (Qtpa)
	Agricultural exemption (Crfea)
	Agricultural industry (Ncgr)
	Agricultural products (Bhkb)
	Agricultural roads USE Farm roads (Pmrccpf)
	Agricultural wastes (Jfkbb)
Agriculture	Agriculture (Ttb)
	Plows (Agriculture) (Qtpap)
AGT	AGT USE Automated guideway transit (Dcmvgyg)
AGVS	AGVS USE Automated guided vehicle systems (Dcmmb)
AICC	AICC USE Autonomous intelligent cruise control (Dcmvgycj)
Aid	AID (Automatic incident detection) USE Automatic incident detection (Dmbytjb)
	Call boxes (Driver aid devices) (Dsgmec)
	Driver aid systems USE Motorist aid systems (Dsfpc)
	Driver assistance systems (Motorist aid) USE Motorist aid systems (Dsfpc)
	Federal aid (Cfhgf)
	Federal aid highways (Pmrccjf)
	First aid (Hpea)
	First aid equipment (Qtpsmf)
	Grant aid (Cfhg)
	Motorist aid systems (Dsfpc)
	Passing aid systems (Dcnsyhp)
	State aid (Cfhgs)
Aided	Computer aided design (Esdb)
	Computer aided engineering USE Computer aided design (Esdb)
	Computer aided instruction (Cexc)
	Computer aided manufacturing (Dcmmd)
	Computer aided routing system USE Advanced driver information systems (Dsfpdb)
Aids	Aids to air navigation (Dcnsxbb)
	Aids to navigation (Dcnsxb)
	Airborne navigational aids (Dcnsxpb)
	Aircraft navigational aids (Dcnsyb)
	Audiovisual aids (Xxwa)
	Avionic navigation aids USE Airborne navigational aids (Dcnsxpb)
	Electronic driving aids USE Motor vehicle navigational aids (Dcnsyh)
	Landing aids (Dcnsybm)
	Motor vehicle navigational aids (Dcnsyh)
	Navigation aids USE Navigational aids (Dcns)
	Navigational aids (Dcns)
	Navigational aids by reference to craft (Dcnsx)
	Navigational aids specific to a craft or vehicle (Dcnsy)
	Onboard navigational aids (Dcnsxp)
	Ship navigational aids (Dcnsys)
	Terminal navigation aids (Dcnsxbbt)
	Vehicle viewing aids (Qpyv)
	Visual aids (Xxwv)
Ailerons	Ailerons (Qpjyb)
Air	Advanced automation system (Air traffic control) (Dcmtbc)
	Aids to air navigation (Dcnsxbb)
	Air (Rbj)
	Air bag restraint systems USE Air bags (Qpqrpb)
	Air bags (Qpqrpb)
	Air bases (Pmfcbb)
	Air brakes (Qpkbc)
	Air cargo (Bbbc)
	Air carriers USE Airlines (Nbbcb)
	Air charter service (Bbgca)
	Air circulation USE Atmospheric circulation (Jbmbkd)
	Air cleaners (Qtped)
	Air compressors (Qtbmbcb)
	Air conditioners (Qtpmcc)
	Air conditioning systems (Pbpvb)
	Air content (Rkcbba)
	Air courier service (Bbeca)
	Air currents (Jbmbkwb)
	Air cushion vehicles (Qbqg)
	Air delivery USE Air drop (Ncegmd)
	Air dried soil (Rbespmb)
	Air drop (Ncegmd)
	Air engines (Qtbmbebb)
	Air entrained concrete (Rbmdhcbb)
	Air entraining agents (Rbmdhcjc)
	Air entraining cement (Rbmdfcb)
	Air entrainment (Sccya)
	Air filters (Qtpedb)
	Air Force personnel (Msnf)
	Air freight USE Air cargo (Bbbc)
	Air heaters USE Air preheaters (Qtpmhbcb)
	Air injection reactors (Qpwxb)
	Air injection systems (Qpnfb)
	Air intakes (Qtpmvb)
	Air law (Crda)
	Air lines USE Airlines (Nbbcb)
	Air mail service (Bbema)
	Air marshals (Law enforcement personnel) USE Sky marshals (Msxus)
	Air navigation USE Aircraft pilotage (Dcnbscb)
	Air navigators (Mtbd)
	Air pilots (Mtbb)
	Air piracy USE Skyjacking (Huthf)
	Air pollutants USE Air pollution (Jfgbb)
	Air pollution (Jfgbb)
	Air pollution control USE Air quality management (Jfgyb)
	Air pollution sources (Jfgbbu)
	Air preheaters (Qtpmhbcb)
	Air pressure (Smipa)
	Air quality (Jfab)
	Air quality management (Jfgyb)
	Air resistance (Smdfdb)
	Air route traffic control USE Enroute traffic control (Dcmtbr)
	Air route traffic control centers (Pmfgc)
	Air routes (Bbhef)
	Air screws USE Propellers (Qphp)
	Air shipments (Bna)
	Air springs (Qpiyrd)
	Air suspension systems (Qpid)
	Air taxi service (Aeac)
	Air traffic (Btaa)
	Air traffic control (Dcmtb)
	Air traffic control facilities (Pmfg)
	Air traffic control radar beacon system (Dcmtbf)
	Air traffic control systems USE Air traffic control (Dcmtb)
	Air traffic controllers (Msdc)
	Air traffic management USE Air traffic control (Dcmtb)
	Air transportation facilities (Pmf)
	Air transportation policy (Crata)
	Air travel (Bmca)
	Air truck transportation (Bbbaf)
	Air voids (Rbmdhcu)
	Air water interfaces (Srbjc)
	Aluminum air batteries (Qtpfbba)
	Clear air turbulence (Jbmbkjc)
	Compressed air (Rbjc)
	Engine air cooling systems (Qtbmbercb)
	Entrained air (Rbmdhcuf)
	Entrapped air (Rbmdhcur)
	Flow control (Air traffic control) (Dcmtbu)
	Flow management (Air traffic control) USE Flow control (Air traffic control) (Dcmtbu)
	Free flight (Air traffic control) (Dcmtbv)
	Fuel air mixtures (Rbfpd)
	Lighter than air craft (Qbkmw)
	Metering (Air traffic control) (Dcmtbum)
	Radar air traffic control (Dcmtbw)
	Side air bags (Qpqrpbs)
	Soil air (Rbesbb)
	Tactical air navigation system (Dcnsybq)
	Terminal air traffic control (Dcmtbx)
	Tracked air cushion vehicles (Qbfxg)
	Wind factor (Air navigation) (Qdbcgw)
Airbags	Airbags USE Air bags (Qpqrpb)
Airborne	Airborne navigational aids (Dcnsxpb)
	Airborne surveying USE Aerial surveying (Esmsfb)
Airbridges	Airbridges (Pmfcgcjc)
Aircraft	Aircraft (Qbk)
	Aircraft accident victims (Mswvab)
	Aircraft accidents (Hbba)
	Aircraft approach spacing USE Approach control (Dcmtbm)
	Aircraft by motive power (Qbkp)
	Aircraft by ownership (Qbko)
	Aircraft by size (Qbkw)
	Aircraft by speed (Qbks)
	Aircraft by type of lift (Qbkm)
	Aircraft cabins (Qpepb)
	Aircraft carriers (Qbhoma)
	Aircraft collisions (Hbbac)
	Aircraft control USE Aircraft pilotage (Dcnbscb)
	Aircraft exhaust gases (Jfgsgea)
	Aircraft fuels (Rbfubb)
	Aircraft gates (Pmfcgcg)
	Aircraft guidance USE Aircraft pilotage (Dcnbscb)
	Aircraft industry (Ncefa)
	Aircraft landing areas USE Landing fields (Pmfcgm)
	Aircraft materials (Rbmuvb)
	Aircraft navigational aids (Dcnsyb)
	Aircraft noise (Jfnbb)
	Aircraft operations (Brc)
	Aircraft pilotage (Dcnbscb)
	Aircraft pilots USE Air pilots (Mtbb)
	Aircraft separation (Dcmtbj)
	Aircraft structural components (Qpgyb)
	Army aircraft (Qbkomm)
	Attack aircraft (Qbkomf)
	Business aircraft (Qbkopc)
	Cargo aircraft (Qbkff)
	Civil aircraft (Qbkoc)
	Commercial aircraft USE Civil aircraft (Qbkoc)
	Commuter aircraft (Qbkhc)
	Company aircraft USE Business aircraft (Qbkopc)
	Corporate owned aircraft USE Business aircraft (Qbkopc)
	Crimes aboard aircraft (Huted)
	Fins (Aircraft) (Qpbbbkf)
	Fixed wing aircraft USE Airplanes (Qbkmf)
	Flaps (Aircraft) (Qpjyf)
	General aviation aircraft (Qbkop)
	Guidance systems (Aircraft) (Dcmvb)
	Human powered aircraft (Qbkph)
	Hypersonic aircraft (Qbksh)
	Jet propelled aircraft (Qbkpj)
	Light aircraft USE Small aircraft (Qbkwf)
	Military aircraft (Qbkom)
	Narrow body aircraft (Qbkwn)
	Naval aircraft (Qbkomn)
	Navigators (Aircraft) USE Air navigators (Mtbd)
	Passenger aircraft (Qbkh)
	Personal aircraft USE Private aircraft (Qbkopp)
	Pilotless aircraft USE Drone aircraft (Qbkomh)
	Private aircraft (Qbkopp)
	Propeller driven aircraft (Qbkpp)
	Remotely piloted aircraft (Qbkomhr)
	Ribs (Aircraft) (Qpgybb)
	Rotary wing aircraft (Qbkmr)
	Short takeoff and landing aircraft USE STOL aircraft (Qbkmj)
	Small aircraft (Qbkwf)
	STOL aircraft (Qbkmj)
	Subsonic aircraft (Qbksb)
	Supersonic aircraft (Qbksf)
	Tails (Aircraft) (Qpbamt)
	Tilt wing aircraft (