B-1521

B-1521 is a Boeing 737-900, a twin-engine jet. SkyMeter has tracked 600 flights totalling 3,220 hours of airtime via ADS-B across 39 callsigns. Service window in our records spans 412 days. The Boeing 737-900 has a 117 ft wingspan, a maximum takeoff weight of 187,700 lb.

About the Boeing 737-900

The Boeing 737-900ER represents the longest and most capable member of the Next Generation 737 family, stretching the fuselage to accommodate up to 220 passengers in high-density configurations while retaining the efficiency and commonality that made the 737 the world's best-selling jetliner. Launched in 2005 and entering service with Lion Air in 2007, the 900ER addressed the shortcomings of the original 737-900 by adding blended winglets, a pair of optional auxiliary fuel tanks, and a flat rear pressure bulkhead, extending range to 3,200 nautical miles and making it a true competitor to the Airbus A321. Delta Air Lines became the variant's largest operator, using the type as a workhorse on transcontinental and Caribbean routes where its 180-seat two-class layout offered an ideal balance of capacity and economics.

The 900ER's performance envelope mirrors its smaller 737NG siblings (Mach 0.82 maximum operating speed, 41,000-foot service ceiling, and approach speeds around 148 knots), but its additional length and weight demand slightly longer runways and more careful weight-and-balance management on short-field operations. Production ended in 2019 as Boeing transitioned the line to the 737 MAX family, but the 900ER remains a frontline aircraft for major carriers who value its maturity, dispatch reliability, and crew commonality across the 737 fleet. SkyMeter has tracked flights across airframes and operators, with the largest observed operator.