The two or three letter symbols for the classes of station in the aviation services are:
Symbol and class of station AX--Aeronautical fixedAVW--Audio visual warning systemsAXO--Aeronautical operational fixedDGP--Differential GPSDLT--Aircraft data link land testFA--Aeronautical land (unspecified)FAC--Airport control towerFAE--Aeronautical enrouteFAM--Aeronautical multicom FAR--Aeronautical search and rescueFAS--Aviation supportFAT--Flight testFAU--Aeronautical advisory (unicom)FAW--Automatic weather observationGCO--Ground Communication OutletMA--Aircraft (Air carrier and Private)MA1--Air carrier aircraft onlyMA2--Private aircraft onlyMOU--Aeronautical utility mobileMRT--ELT testRCO--Remote Communications OutletRL--Radionavigation land (unspecified)RLA--Marker beaconRLB--RadiobeaconRLD--RADAR/TESTRLG--Glide pathRLL--LocalizerRLO--VHF omni-rangeRLS--Surveillance radarRLT--Radionavigation land testRLW--Microwave landing systemRNV--Radio Navigation Land/DMERPC--Ramp ControlTJ--Aircraft earth station in the Aeronautical Mobile-Satellite ServiceUAT--Universal Access Transceiver [53 FR 28940, Aug. 1, 1988, as amended at 57 FR 45750, Oct. 5, 1992; 64 FR 27475, May 20, 1999; 69 FR 32882, June 14, 2004; 71 FR 70676, Dec. 6, 2006; 76 FR 17351, Mar. 29, 2011; 78 FR 61206, Oct. 3, 2013]