Windsor Locks, Connecticut:
This was a pig that truly could not fly.
The pig was ordered off a U.S. Airways plane at Bradley International Airport in Connecticut on Wednesday after crewmembers determined the animal had become disruptive.
Laura Masvidal, a spokeswoman for U.S. Airways parent American Airlines, said Friday the pig was brought aboard by a passenger as an emotional support animal.
She said both the pig and its owner left the aircraft before it took off.
Jonathan Skolnik, a University of Massachusetts professor who was also a passenger, told ABC News that the pig - which he estimated to weigh about 50-70 pounds, was on a leash but began walking back and forth.
Masdival says under federal guidelines emotional support animals are allowed on commercial flights as long as they're not disruptive.