ZM321

ZM321 is a Grumman G-1159A, a twin-engine jet. SkyMeter has tracked 1,250 flights totalling 1,094 hours of airtime via ADS-B across 117 callsigns. The most frequent segment is EGYD to EGYD. Service window in our records spans 502 days. Of those flights, 186 (14.9%) carry at least one detected incident: a go-around, unstable approach, stall warning, or runway excursion. The Grumman G-1159A has a maximum takeoff weight of 73,200 lb, medium wake category.

About the Grumman G-1159A

The Grumman Gulfstream II-TT (G1159A) is a specialized trainer derivative of the iconic Gulfstream II business jet, purpose-built for military and commercial pilot training programs. While the baseline Gulfstream II revolutionized corporate aviation in the late 1960s as one of the first purpose-designed business jets with transcontinental range, the TT variant strips away the executive interior in favor of instructor stations, avionics bays, and mission systems that replicate fighter and transport cockpits. CAE and other training providers operate these aircraft to give military pilots realistic jet handling experience in a relatively affordable twin-engine platform, simulating everything from tanker operations to tactical approaches without the operating costs of frontline combat aircraft.

Powered by two Rolls-Royce Spey turbofans producing 11,400 pounds of thrust each, the G1159A cruises at Mach 0.80 and can reach altitudes above 43,000 feet, providing a flight envelope that overlaps with many military transports and trainers. Its 73,200-pound maximum takeoff weight and durable airframe allow for repeated training sorties with high cycle counts that would age a business jet prematurely. The type's long service life in training roles (some airframes have been flying training missions for over three decades) speaks to Grumman's structural engineering and the aircraft's adaptability to evolving training requirements.

SkyMeter has tracked flights across airframes and operators, with the largest observed operator.