Last week I noticed a lot of people at EWR using mobile boarding passes, but only a few were using the CO app. I thought it worth mentioning to the forum that CO apps exist for both iPhone and Droid, and they are (in my opinion) easier than the pda site. I use the iPhone app, and here are some of the key features: Online check-in where you can change seats and check bags. Also prompts you for how you'd like your boarding pass delivered... mobile, email, etc. Mobile boarding passes - they don't turn like the pda site does, so it is much easier to use through TSA and boarding. Also doesn't refresh once it is loaded, so if you lose your WiFi/3G, it is still there for you to use (which is key at a place like EWR). Flight status: you can search by flight number or city pairs, then get status, seat maps, standby list, upgrade list, and in-flight amenities, and you can see where your inbound is coming from (and that status). Reservations: it shows you your upcoming reservations in your CO account. Booking flights Airport maps Your OnePass account. Miles, status, progress to status, etc... Location PClubs and RCCs and more. Timetable of all flights Even some games! This is probably the most useful app I have, and I'm fairly sure (based on rumor and innuendo!) that the new UA will use this app with modifications. The iPhone app is available in the AppStore and/or on iTunes for free (someone will have to post how you'd get the Droid app).