N37521

Boeing 737-9 MAX airframe N37521 was built in 2020 with manufacturer serial number 64497 and is operated by United Airlines, Inc., a corporation based in Chicago, IL, US. The airframe is registered in the US and carries the type designation Boeing 737-9 MAX from The Boeing Company. Public records for notable registry actions or prior owners are Not published; the aircraft is listed in United's single-aisle mainline fleet and typically operates from the carrier's Chicago operating base. Condition and valuation specifics beyond factory and operator configuration are not publicly disclosed.

The airframe is outfitted in a single-aisle, two-class cabin in the operator's configuration with approximately 179 seats, reflecting United's dense mainline seating arrangement for the 737-9 MAX. Typical mission profiles for this registration include short- to medium-haul domestic and transcontinental flights within the aircraft's approximately 3,300 nm capability, leveraging cruise speeds near 450 kts and a service ceiling of 41,000 ft. Maintenance and operational oversight follow United Airlines' corporate procedures; no unique aftermarket cabin amenities or optional operator-specific modifications are published for this individual serial. Avionics suite details are not separately published for this airframe beyond the factory standard offered by The Boeing Company for the 737-9 MAX family.

The Boeing 737-9 MAX represents the stretched member of the MAX family, targeting higher-capacity single-aisle market segments with commonality to other MAX variants. With two CFM International LEAP-1B turbofan engines rated at 29,320 lbf each, the model competes with larger variants of the Airbus A320neo family for short- and medium-haul trunk routes. Buyer demand for this class centers on mainline carriers seeking seat-mile efficiency at up to 179 seats; resale and maintenance considerations focus on LEAP-1B engine support, MAX-specific maintenance programs, and fleet commonality within operators such as United Airlines, Inc..