Inmarsat's Classic range of aeronautical services supports high-quality voice, low-speed data and safety communications. They are used by most of the world's airlines and corporate jet operators, as well as governments for VIP aircraft, coastguard and defence agencies.

There are six services, which vary in capability, coverage, equipment size and cost:

Multi-channel voice, 10.5kbps fax and data, delivered via a high-gain antenna within the spot beams of the Inmarsat-3 satellites and the full footprint of the Inmarsat-4 Atlantic Ocean Region (AOR) satellite, at a lower cost per connection. ICAO approved for safety services.

Global data communications at 600 to 1200bps, principally to support air traffic control and airline operations. Supports Acars/Aircom messaging. ICAO approved for safety services.

Supports two-way 600bps store-and-forward data messaging, polling and integrated GPS position-reporting for non-safety-related purposes.