N990ST

This airframe, registered as N990ST, is a Boeing 737-4Y0(C) built by The Boeing Company in 1989 with manufacturer serial number 24493. It is owned by the government entity National Nuclear Security Administration based in Albuquerque, NM, US, and is listed on the US civil registry as a fixed-wing transport. The registry records a 149-seat transport configuration; operator-specific interior details and avionics fit are not published. No public record of alternate commercial operators or prior civil sales was supplied in the provided data.

The aircraft is configured with 149 seats in a transport layout per registry entries; operator-specific interior arrangements and any special mission outfitting are not published. Operated and domiciled by the National Nuclear Security Administration in Albuquerque, NM, US, its typical missions are consistent with government transport and logistical support roles that prioritize medium-range, high-capacity movement rather than commercial passenger service. Maintenance considerations reflect standard 737-400 series requirements, with continued airworthiness dependent on the CFM56-3C engine support and component availability for airframes built in 1989. Avionics and cabin amenity specifics for this tail number are not disclosed in the supplied data.

The Boeing 737-4Y0(C) sits within the 737-300/400 generation, offering a mid-capacity, short- to medium-range performance niche with a cruise speed of about 485 kts and a service ceiling near 37,000 ft. Competing types historically include earlier-generation narrowbodies from the same era that balance seating capacity and range; modern replacements in the market are focused on improved fuel efficiency and updated avionics. For government operators like the National Nuclear Security Administration, resale and maintenance considerations center on airframe age (built 1989), interior reconfiguration costs from the recorded 149-seat transport layout, and ongoing support for the CFM56-3C engines.