Sec. 87.275  Scope of service.

    Aeronautical fixed stations provide non-public point-to-point 
communications service pertaining to safety, regularity and economy of 
flight. These stations must transmit, without discrimination, messages 
from aircraft which have entered into cooperative arrangements governing 
the operation and maintenance of such stations. Aeronautical fixed 
station licensees are required to transmit, without charge or 
discrimination, all emergency communications.