(NEWSER) – Good news, twitchy fliers: Your fears of flying aren't completely irrational. The latest tale of concern comes via American Airlines, which apparently managed to fly the wrong plane to Hawaii last month in a decided FAA no-no. The incident, first reported by aviation blogger Brian Sumers after he spotted pilots chatting anonymously online, happened when American started flying Airbus A321s from Los Angeles to Hawaii.

American has two versions of the A321, notes Sumers: Those approved for long flights over water—an FAA certification called ETOPS—and those that are not. American accidentally grabbed an A321 that wasn't certified for the Aug. 31 flight, notes the Washington Post, a mistake that wasn't noticed until halfway through the flight.

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