Did a search for "Citibank ORD" and didn't find anything, so I'm sorry if this has already been posted. Passed through ORD yesterday and Citibank had a stand set up across from the H-K Admirals Club, handing out 500 mile certificates if you show them your Citibank Aadvantage card. Don't know how long this is going on, but definitely an easy 500 miles.