Samm Levine, the geek on Freaks and Geeks who would have been dropped by his senior year by the other geeks for being too geeky, was picking up a friend at the Terminal A baggage claim. Levine was dressed in a t-shirt, jeans, baseball hat, and the piece de resistance, BIRKENSTOCKS! He looked like a kid I would have (regrettably) made out with at camp. In 1993.
According to IMBD, Levine's got a few projects in the can, so I'll assume the friend he was picking up was indeed a friend, and not a customer of his airport delivery service.