Original: On  5 September 1986 a Pan American World Airways Boeing 747-121 named Clipper Empress of the Seas, operating as Pan Am Flight 73, was hijacked by Palestinian gunmen posing as airport officials upon arrival from Bombay, India.
Simplified: A Pan American Boeing 747 named the Clipper Empress of the Seas, called Pan Am Flight 73, was hijacked on September 5, 1986.