N21723 - 1999 Boeing 737-724 Aircraft Registration

N21723 is a 1999 Boeing 737-724, a twin-engine turbo-fan aircraft registered to United Airlines INC in Chicago, IL. This aircraft holds a standard airworthiness certificate issued by the Federal Aviation Administration on April 21, 1999. The registration certificate was issued on April 23, 1999. The registration is set to expire on January 31, 2030. Powered by a Cfm Intl. CFM56 SERIES engine producing 2200 horsepower, N21723 is. The aircraft's Mode S transponder code is A1D63D (hex), used for ADS-B identification and flight tracking. N21723 was last tracked by AviatorDB near Newark Liberty International Airport (KEWR) on April 2, 2026. The FAA registry record for N21723 was last updated on November 3, 2025. AviatorDB monitors aircraft positions through ADS-B surveillance data and updates records as new position data is received.

The Boeing Company, headquartered in Arlington, Virginia, is one of the world's largest aerospace companies. Boeing has manufactured commercial airliners, military aircraft, and space vehicles since 1916, with iconic products including the 737, 747, 767, 777, and 787 Dreamliner. AviatorDB tracks 6,953 Boeing aircraft currently registered in the FAA database, including the 737-724 model.

AviatorDB has found no NTSB accident or incident reports involving N21723. AviatorDB cross-references all FAA registration data with NTSB accident and incident reports, providing a comprehensive safety overview for every registered aircraft in the United States.