Definition
A formal FAA authorization that permits a third-party communications service provider to relay air traffic control communications, flight information, or position reports between aircraft and ATC, typically over satellite or data link networks in remote or oceanic airspace where direct VHF radio contact is not possible.
Plain English
Official permission for an outside company to handle radio or data messages between aircraft and air traffic control, usually in parts of the world where normal radios won't reach.
Context Anchor
Seen in FAA abbreviation lists, facility information, and aviation notices where communications services are being identified or limited.
Derivation
‘Communications’ — the exchange of messages. ‘Service’ — something provided to another party. ‘Authorization’ — formal permission from an authority. Together: official permission to provide a communications service. The word matters because it tells you this isn't just a capability — someone has been formally approved to do it.
Why Pilots Care
On long-haul and oceanic flights, pilots rely on these authorized providers to stay in contact with ATC. Knowing a provider holds a CSA is part of confirming the communication chain is legitimate and approved.
Intuition Check
Do not read CSA as a clearance given to one pilot for one flight. Here it refers to authorization for a communications service or facility, not permission to take off or land.
Example Sentence 1
The operator confirmed that the satellite data link provider held a current CSA before dispatching the flight across the North Atlantic.
Example Sentence 2
Pilots benefit when a CSA ensures reliable communication coverage in remote areas.