What Kind of Plane Am I Flying On? After engine debris from a Boeing 777-200 rained down on a Denver suburb, some fliers may want to know more about plane safety and maintenance. Here are some answers. A United Airlines plane flying from Denver to Honolulu returned to Denver International Airport with an engine on fire after it called a Mayday alert on Feb. 20.Credit...Hayden Smith/@Speedbird5280/Via Reuters By Debra Kamin Feb. 26, 2021 Passengers on board a United Airlines flight from Denver to Honolulu had several moments of terror on Feb. 20 when their plane, a Boeing 777-200, experienced a right-engine failure shortly after takeoff, causing a massive bang and sending debris raining down over a quiet Denver suburb. Passengers captured video, much of it shared on social media, of the plane’s Pratt & Whitney engine, its cover ripped off, its turbine oscillating and in flames. The plane, which had 231 passengers and 10 crew members on board, returned to Denver and landed safely.