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TRB Publications IndexResearch in ProgressTRID
Facilities (P) Use For: Complexes; Installations Transportation, hydraulic and utility facilities (Pm) Air transportation facilities (Pmf) Use For: Aeronautical facilities; Aviation facilities; Civil aviation facilities Air traffic control facilities (Pmfg) Use For: Ground stations Air route traffic control centers (Pmfgc) Airport control towers (Pmfgf) Flight service stations (Pmfgs)