Sec.  87.265   Administrative communications.

   Domestic VHF aeronautical enroute stations authorized to use A9W emission on
   any frequency listed in  Sec. 87.263(a)(1) or  Sec. 87.263(a)(3) may transmit digital
   administrative communications on a secondary basis, in addition to the
   operational and control communications routinely permitted under  Sec. 87.261(a)
   above. Such secondary administrative communications must directly relate to
   the business of a participating aircraft operator in providing travel and
   transportation services to the flying public or to the travel,
   transportation or scheduling activities of the aircraft operator itself.
   Stations transmitting administrative communications must provide absolute
   priority for operational control and other safety communications by means of
   an automatic priority control system.

   [ 54 FR 11721 , Mar. 22, 1989]

Aeronautical Fixed Stations