Frontier Airlines Flight Declares Mayday After Lavatory Floods The Cabin — “We’re Worried About Electronics”

A bathroom sink sprang a leak on Frontier Airlines flight 3566, spraying so much water into the cabin that the pilot declared “Mayday, Mayday, Mayday” and requested a diversion. It was so bad he told air traffic control, “We’re worried about electronics.” The Denver – Detroit flight landed safely in Chicago. This may be the most Frontier Airlines story ever that doesn’t involve a passenger fight. The November 11 flight was operated by an Airbus A321neo N688FR. “Our forward lav sink has sprung a leak and it’s spraying so much water, it’s flooding, uh, the cabin area in the back. We’re worried about electronics. We’d like to divert to Chicago O’Hare.” Frontier flight 3566 declares an emergency over a flooding lavatory — November 11, 2026 The pilot reads back a clearance directly to O’Hare, asks to begin descending while the crew prepares for the arrival, and then reads back an instruction to descend to 24,000 feet. The just begs for potty jokes, but the leak was spraying water, not a passenger clogging the toilet. And there wasn’t apparently sewage flowing through the aircraft. The reason to get the aircraft on the ground before water finds its way into the avionics is well-established. The NTSB concluded that a Delta Boeing 767 investigation faced freezing flight control components as a result of leaking water that froze, limiting control over the aircraft’s ailerons. Here, the Frontier aircraft landed safely. I covered a Delta flight in June where passengers were told to hold their bags in their laps for landing as water spread through the cabin approaching San Francisco. And the closest comparison is an Alaska Airlines flight from Honolulu to Anchorage that turned around after a sink overflow. Passengers reported two to four inches of standing water. Flight attendants tried to soak it up with paper towels. And some of you still walk into airplane lavatories barefoot. Topics on this page