Digital radio communication for aircraft

A digital radio communication system for an aircraft, comprising:

• a cellular base station transceiver;
• and
• a data processing system,
• wherein the cellular base station transceiver and the data processing system are configured for location within an aircraft and the cellular base station transceiver is configured for transmitting data to, and receiving data from, mobile cellular devices located within the aircraft;
• wherein the cellular base station transceiver is configured to receive, by radio from a mobile cellular device located within the aircraft, an identifier associated with an embedded Subscriber Identity Module (eSIM) installed on the mobile cellular device;
• and
• wherein the digital radio communication system is configured:
• to use the data processing system to determine whether the received identifier matches an identifier of a stored set of identifiers authorised for the aircraft, each identifier of the stored set of identifiers being associated with a respective eSIM associated with the aircraft;
• when an identifier match exists and optionally one or more further conditions are met, to transmit a radio signal indicative of a successful eSIM authentication to the mobile cellular device;
• and
• when an identifier match does not exist, to transmit a radio signal indicative of an unsuccessful eSIM authentication to the mobile cellular device.