At that time , the crash of Flight 663 was the fifth worst aviation accident to have occurred in the United States . It is the third deadliest crash of a DC-7 ( after Caledonian Airways Flight 153 and Northwest Airlines Flight 293 ) , and is the 25th deadliest single-plane accident to have occurred in the United States
Caledonian Airways Flight 153
Caledonian Airways Flight 153
Eastern Air Lines Flight 663