Post reporter experiences tense United flight For more than three hours late Monday afternoon, before boarding up more than 200 passengers on Chicago-to-Denver flight 909, United Airlines officials had tried to cool down an extremely hot widebody jet at O'Hare International Airport. The auxiliary power unit, or APU, on the Boeing 777, which generates electricity for planes when engines are shut down at the gate, was broken. Chicago's 100-degree heat and blazing sun had baked the plane's dark blue and gray skin, sending temperatures in the empty cabin soaring to at least 115 degrees.
Flight 909 had been scheduled for a 2:45 p.m. departure. To cool the cabin down, United first tried pumping air in at the gate. That didn't work. Then they started one engine at the gate, pushed the plane back and took it to a holding pad to get air flowing. All other flights to Denver were booked full throughout the day. United tried to find a replacement plane for the 777, but none was available. If the company cancelled flight 909, it might be putting hundreds of travelers up in hotels.