L3Harris EA-37B Compass Call

EA-37B are Gulfstream G550 business jet airframes modified with electronic warfare equipment by L3Harris and BAE Systems. The most distinctive feature are the large antenna arrays conformally mounted on either side of the fuselage; these are based on the radar arrays found on the G550 CAEW (Conformal Airborne Early Warning). The aircraft has gone through multiple "Baseline" iterations throughout its development, with Baseline 4 being the latest. It incorporates BAE Systems' Small Adaptive Bank of Electronic Resources (SABER) technology. Among the equipment also found on the aircraft are: Network Centric Collaborative Targeting (NCCT) systems, System Control and Monitoring subsystems, Radio Frequency Receiver (RFR) subsystems, Software-defined Radio (SDR) subsystems, Counter Radar Assembly, Array Panels, AN/ARC-210 RT-2036 radios, KG-250 In-line Network Encryptors, KY-100 Narrow/wideband Terminals, KIV-77 Mode 4/5 Identification Friend or Foe (IFF), AN/PYQ-10C Simple Key Loaders == History ==

, Arizona, 17 August 2022. On 7 September 2017, the US Air Force awarded L3 Technologies (now L3Harris) a contract to replace the EC-130H Compass Call with an aircraft based on the Gulfstream G550. The new aircraft was expected to "re-host" up to 70% of the mission equipment currently used on the EC-130H. On 23 August 2024, the first ready aircraft (serial number 19-5591) was delivered to Davis-Monthan AFB to begin pilot training. The aircraft's first mission training sortie was flown on 2 May 2025 by the 43rd Electronic Combat Squadron out of Offutt Air Force Base, Nebraska. == Designation ==

Originally designated EC-37B, as an electronic warfare version of the C-37B transport jet under the tri-service aircraft designation system. The designation was officially changed to EA-37B on 14 November 2023 to better reflect the aircraft's role and capabilities although the name change had been hinted at before. The new designation does however conflict with that of the unrelated A-37 Dragonfly, itself a non-systematic designation. == Operators ==

— 10 aircraft ordered, 5 delivered as of May 2025. Operated by the 55th Electronic Combat Group, a part of Air Combat Command. — Ordered two EA-37B Electronic Attack mission system packages, which will be used to convert two Gulfstream G550 into EA-37B. == Specifications ==