N135SM

The airframe bearing tail number N135SM is a Bombardier Challenger 604 (CL-600-2B16) built in 2000, serial 5444, and currently registered in the United States. Ownership is recorded to Stonegate Leasing 2020 LLC with a registrant address on file in Natick, MA, reflecting a corporate lessor custody rather than a named individual operator. No alternate operators or transfers are published in the supplied dataset; the listed corporate owner implies use in lease, charter or fractional operations rather than sole private ownership. Valuation and condition highlights show an estimated market value of $5,400,000, consistent with mature airframes of this model and vintage.

This specific Challenger 604 is outfitted with a typical two‑zone executive interior accommodating 10–12 seats in a forward club, mid divan/club and aft conference/seat area configuration; the record for this tail lists 10 seats and includes an enclosed lavatory, forward galley and 115 cu ft of internal baggage. Avionics fit is the variant‑typical Collins Pro Line 4, supporting the airframe’s long‑range corporate mission profile. With a published cruise of 425 kts and 4,000 nm range, typical operations for this aircraft under its corporate lessor would include transcontinental and some transoceanic ferry or charter sectors, with maintenance considerations aligned to CF34‑3B engine lifecycle and avionics support for Pro Line 4 retrofits or upgrades.

The Bombardier Challenger 604 family occupies the super‑midsize executive twin segment, offering long range and comfortable cabin volume relative to light jets. Competing models in its era include late‑model Gulfstream‑class and Dassault Falcon offerings, though the Challenger 604 is often selected for its combination of range and cabin layout. Buyer and charter demand for a 2000‑built Challenger 604 like N135SM typically weighs acquisition price, engine shop‑visit history and avionics modernization needs; resale considerations emphasize remaining structural life, CF34 maintenance status and the potential cost of Pro Line 4 upgrades or integration into current avionics support programs.