I wasn't on the flight in question, but it was widely reported in October of 2000 that two women, accompanied by a 300-pound pig flew in first class on a US Airways flight from PHL to SEA.

According to one eyewitness, it took four people to wheel it in, past security and to the gate. The women claimed that the pig was a therapeutic service animal.

After the flight landed in Seattle, the pig became unruly as the Boeing 757 taxied to the gate, and reportedly ran loose through the aircraft, squealed loudly and tried to enter the cockpit.

According to first hand reports, the pig took refuge in the food galley, where it refused to budge. Finally, someone lured the pig from the galley with food. The two female owners could not control the beast, and it reportedly defecated on the jetway after exiting the aircraft.

Associated Press report on CNN

Mike