Delta Air Lines Flight 81 declared an emergency for an overweight landing at Heathrow after a lavatory issue forced the Paris-to-Seattle diversion.
https://www.foxnews.com/us/delta-flight-diverted-twice-lavatory-leak-floods-cabin-leaves-passengers-stranded-hours
https://www.foxnews.com/us/delta-flight-diverted-twice-lavatory-leak-floods-cabin-leaves-passengers-stranded-hours