The airplanes hijacked on 9/11 begin taking off at 7:59 a.m. The first to depart is American Airlines Flight 11, a Boeing 767 that leaves Boston’s Logan International Airport for Los Angles with 92 people on board. At 8:14 a.m., United Airlines Flight 175 — a Boeing 767 with 65 passengers on board — leaves Logan for Los Angeles.
https://www.huffpost.com/entry/september-11-timeline_n_3901837