Boeing selects Leonardo’s airborne SDR for Nato’s E-3A AWACS fleet 15 April 2021 (Last Updated April 15th, 2021 14:29) Boeing has selected Leonardo’s software-defined radio (SDR) for the Nato fleet of E-3A Sentry Airborne Warning and Control System (AWACS) aircraft. A Nato Boeing E-3 Sentry Airborne Warning and Control System (AWACS) aircraft. Credit: Jwh. Share Article Boeing has selected Leonardo’s software-defined radio (SDR) for the Nato fleet of E-3A Sentry Airborne Warning and Control System (AWACS) aircraft. The SDR to be provided by Leonardo is SWave Airborne SRT-800. Nato owns and operates the AWACS aircraft fleet, which is under the Final Lifetime Extension Programme (FLEP) with Boeing.