Someone just made a post with airport Identifiers. There are so many in the states I have a bit of a problem.
Here is a website you can use to decode them. Its down the page a bit but works good. Remember we not only have three letter identifiers for larger airports. All the small ones have letter/number combinations and its on the site also.
http://www.faa.gov/atpubs/LID/LIDHME.HTM