An American Airlines flight bound for Dallas in March experienced an engine fire due to loose parts installed in the wrong direction and fuel leaks, an NTSB investigation revealed on Thursday.

American Airlines Flight 780 left Philadelphia International Airport at 7:42 p.m. local time on Monday and was supposed to land in Naples, Italy, at 10 a.m. local time, according to FlightAware.

A nosy American Airlines passenger forced her flight into a diverted landing by reporting a bomb threat over a drastically misinterpreted text message they spied on another flyer’s phone. The ...