Murder On Flight 502

TOA airlines flight 502 takes off from New York City to London. At the airport, a bomb threat in the airline's first-class passenger lounge turns out to be an elaborate prank. Safety official Donaldson receives a letter explaining that a series of murders will take place on Flight 502 before it lands.

Left in the lounge for first-class passengers, a letter warns of murders on Flight 502 -- and the warning is received a day early.