I rarely refer to the actual timetable, but an iPhone app that actually duplicates much of the functionality of the website but without requiring you to wait as long for pages to load (we're still on EDGE up here) would be AWESOME. Timetable information could be included, but I'd love it if it could include fares and availability, access to my Mileage Plan account and upcoming trips, and other commonly-used things. (Maybe even web check-in with the option to fax the boarding pass to a fax machine you happen to be walking by? Ooh...)

I still can't get over the fact that I was able to do all that just an hour or so ago on the iPhone's browser without any problems, but an app that makes navigating these things quicker and easier would be awesome. (Same thing goes for Gmail--the built-in IMAP mail client, by its very nature, is missing key Gmail features whole message search and contact search, and the Gmail iPhone interface in the web browser is much better but very slow. I was used to my old phone's Gmail J2ME app--would be awesome if Google made one for the iPhone!)