I'm not flying Southwest.
If a person gets booted off the plane for a shirt that says "Meet the Fockers" that has pictures of Bush, Cheney, and Rice on it, I would turn around and sue Southwest for violation of the persons civil liberties and their ignorance towards a persons constitutional freedom.
Any court of law in the land would allow the shirt to be worn as millions of movie posters were distributed with "Meet the Fockers" (and to think it was even an on-board movie somewhere). So bring on the lawsuit or at least the PR nightmare in the blogosphere for Southwest.
UPDATE: (6:45pm) It has come to my attention that the shirt had the word F**ckers, and not Fockers. Still this does not change my opinion, I would still defend her based on the precedent set in the "F**k the Draft case."
Cohen v. California
403 U.S. 15 (1971)
According to Oyez: "In an opinion by Justice John Marshall Harlan, the Court reasoned that the expletive, while provocative, was not directed toward anyone; besides, there was no evidence that people in substantial numbers would be provoked into some kind of physical action by the words on his jacket."