Date: May 29, 1947
Location: Queens, New York
Aircraft: Douglas C-54B
Reg: NC30046
Airline: United Air Lines
Flight No: 521
Fatalities: 48 : 43

The aircraft overran the runway during an attempted takeoff, crashed and caught fire. Either the failure of the pilot to release the gust lock before take-off or his decision to discontinue the take-off because of apprehension resulting from rapid use of a short runway under a possible calm wind condition.