A group of Croatian terrorists made up of Zvonko and his wife, Julienne Bušić, Petar Matanić, Frane Pešut and Slobodan Vlašić hijacked a commercial Trans World Airlines plane on September 10, 1976. It was Boeing 727 Flight 355, heading from New York City to Chicago. The mastermind of this terrorist group, Zvonko Bušić delivered a sealed letter to the pilot, Captain Carey. The letter informed the Captain that the airplane had been hijacked. It said that the hijackers had five gelignite bombs, and that a bomb had been planted in a locker across from the Commodore Hotel on 42nd Street in New York with the further instructions that the U.S. authorities should follow. The hijackers demanded heading the plane in the direction of London. Their ultimate demands, given in the instructions, were: