Bring your driver's license and have (if you don't automatically know) all your relavent data such as SS#, date of birth, contact number (and backup),etc. etc.
I believe if you are going to work at the airport the Homeland Security Department has gotten involved where
UPS has to do a very thorough background check where you have to list your schooling all the way back to pre-school, past jobs, aliases, convictions, etc.
Positive, attentive, gung ho attitude goes over real well.
While making it manditory to be currently attending college to get or keep a part-time position was struck down decades ago it still is a major plus.