On NUMBER@1 September NUMBER@2 a ORGANIZATION@1 NUMBER@3 named Clipper Empress of the Seas , operating as Pan Am Flight NUMBER@4 , was hijacked by MISC@1 gunmen posing as airport officials upon arrival from LOCATION@1 , LOCATION@2 .

A ORGANIZATION@2 NUMBER@5 named the Clipper Empress of the Seas , called Pan Am Flight NUMBER@4 , was hijacked on September NUMBER@1 , NUMBER@2 .
