N256QS

N256QS is a Canadair Challenger 600/601/604, a twin-engine jet operated by AJAX II LLC, JOHNSON DOUGLAS C TRUSTEE, GORDON-JOHNSON VALERIE T. SkyMeter has tracked 964 flights totalling 1,875 hours of airtime via ADS-B across 2 callsigns. The most frequent segment is KBOS to KTEB. Service window in our records spans 401 days. Of those flights, 62 (6.4%) carry at least one detected incident — go-around, unstable approach, stall warning, or runway excursion. The Canadair Challenger 600/601/604 has a 64 ft wingspan, a maximum takeoff weight of 47,600 lb.

About the Canadair Challenger 600/601/604

The Bombardier Challenger 604 redefined the super-midsize business jet category when it entered service in 1996, combining transcontinental range with a wide-body cabin that seats up to 12 passengers in executive comfort. Built in Montreal, the CL-600-2B16 (its formal designation) stretched the fuselage of the earlier Challenger 601 and introduced General Electric CF34-3B turbofans, giving it a 4,000-nautical-mile range capable of nonstop flights from New York to Paris or Los Angeles to London. The type became a fractional-ownership workhorse, with NetJets operating one of the largest fleets globally, and remains popular among corporate flight departments for its reliability and dispatch rate exceeding 99 percent.

Its wide cabin—over six feet tall and nearly eight feet across—set a benchmark that competitors still chase, offering stand-up headroom and a flat floor rare in its class. The 604's operating envelope includes a maximum cruise speed of Mach 0.85 and a service ceiling of 41,000 feet, allowing it to overfly most weather and traffic. Bombardier delivered more than 350 Challenger 604s before production ended in 2007, replaced by the 605 and later the 650.

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