Aero I is a multi-channel voice, 4.8 kbps circuit-mode data & fax service, delivered through an intermediate-gain antenna. Aero I is ICAO approved for safety services. Service is available within the spot beams of the Inmarsat-3 satellites and supports low-speed packet data in both the Inmarsat-3 spot beams and in the full footprint of the Inmarsat-4 satellites.