WINDSOR LOCKS, Conn. — This was a pig that truly could not fly.

The pig was ordered off a US Airways plane in Connecticut Wednesday after crew members determined it had become disruptive, Laura Masvidal, an airline spokesman said Friday.

The pig had been brought aboard the flight by a passenger as an emotional support animal, Masvidal said. She said both the pig and its owner left the aircraft before it took off.

Jonathan Skolnik, a University of Massachusetts professor who was on the flight, said he initially thought the female passenger who sat next to him was carrying a duffel bag. Then he smelled a stench and saw the pig.

“Oh no, it gets worse: the pig is incontinent,” he wrote.