Delta iPhone app

The new Delta iPhone app looks pretty slick. It does not have bells and whistles. It found my non-rev listings by record locator but would not let me check in. It said that there was a technical problem, please try again. Oh well, lets hope it makes many pax happy. I work UA as well as Delta and the UA system lets non-revs checkin online and even print a seat request.
I can access travelnet on the iphone but its clear that the web page was not built for iphones. A bit cumbersome.