On August 31, Airbus A321-S which was not authorised to fly long distances over open water made the flight to Honolulu around 4108 kms approximately, instead of the correct aircraft A321-H.
According to American spokesman Casey Norton, "someone on the ground" realised the mix-up sometime after AA Flight 31 had departed Los Angeles International Airport on August 31, filled with passengers and crew.
The plane that made the trip is the same plane as the one that was supposed to make it, an Airbus A321H, aside from having an "ETOPS" certification, which requires the plane to carry additional equipment.
As the two planes are equipped with the same engine, fuel tanks, range and basic safety features but A321-H is used for long flights which comes with more medical supplies and safety features.
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"When we realised what happened, we immediately notified the FAA and began a thorough review of our procedures," Norton said.
"Already, we have revised our software to properly identify the correct aircraft are operating the correct routes."
Hawaii-bound aircraft are required by the FAA to have extra fire suppression equipment in the cargo hold and extra medical equipment on board, including oxygen -- since there are no points in between for an aircraft to divert to if there is an on board emergency.
The return flight on that aircraft was cancelled, and the plane was flown back to Los Angeles International Airport with just a minimal crew on board.