N54561

N54561 is a Boeing B-17G, a four-engine piston aircraft operated by UNITED AIRLINES INC. SkyMeter has tracked 334 flights totalling 779 hours of airtime via ADS-B across 103 callsigns. The most frequent segment is KDEN to KORD. Service window in our records spans 44 days. Of those flights, 4 (1.2%) carry at least one detected incident: a go-around, unstable approach, stall warning, or runway excursion. The Boeing B-17G has a maximum takeoff weight of 65,500 lb, medium wake category.

About the Boeing B-17G

The Boeing B-17 Flying Fortress is the most iconic American heavy bomber of World War II, famous for its ruggedness, defensive firepower, and ability to absorb catastrophic battle damage and still bring crews home. First flown in 1935 and entering service in 1938, the B-17 became the backbone of the U.S. Eighth Air Force's daylight strategic bombing campaign over Europe, with the G-model representing the definitive production variant featuring a chin turret and improved defensive armament totaling thirteen .50-caliber machine guns. More than 12,700 B-17s were built, with the type flying some of the war's most famous and costly missions including the raids on Schweinfurt and Regensburg.

The Flying Fortress earned its legendary status through a combination of structural strength, redundant systems, and operational ceiling that allowed formation bombing from altitudes above 25,000 feet, beyond the effective reach of most flak and fighters early in the war. Its four Wright R-1820 Cyclone radial engines, each producing 1,200 horsepower, gave it a maximum speed of 287 mph and a combat radius exceeding 1,000 miles with a typical 4,000-pound bomb load. The aircraft's ability to remain airborne on two engines and limp home with massive structural damage became the stuff of legend, with countless accounts of B-17s returning to base with engines out, tail sections nearly severed, and gaping holes in wings and fuselage.

Today, fewer than a dozen B-17s remain airworthy worldwide, maintained by warbird organizations and museums as flying memorials to the 47,000 aircrew members killed flying them in combat. These survivors are meticulously restored to G-model configuration and operate under strict FAA limitations, typically powered by original or overhauled R-1820 engines and flown at weights well below the wartime maximum of 65,500 pounds. The type's stall characteristics remain demanding (power-on stalls can break sharply, and asymmetric thrust on two engines requires immediate corrective action), making current operators among the most experienced warbird pilots in the world.

SkyMeter has tracked flights across airframes and operators, with the largest observed operator.