I’ll begin with a caveat: I’m a very new (just a few weeks) smartphone user, so I have no experience with other airline apps and cannot compare this one with them.
That said, I love this app. I just took my first trip (two flights each way) using this app, and it was lovely. Having bought my ticket months ago from Delta’s web site, I downloaded this app to my new iPhone SE, in preparation for the trip. Once logged in to the app, it knew my trip detains. When I got the email telling me it was time to check in for my flight, I opened the app, and followed the easy prompts to check in and download my boarding pass to the app. Everything worked flawlessly.
One thing I especially liked is the bag tracker. A big source of stress for me when I travel is not knowing if my bags made it onto the plane. Once I was on the plane and before they closed the cabin door and required phones to be in airplane mode, I was able to click on “bags” in the app, and see that my bags were on the plane. That alone made the app worthwhile.
Also, I’ve often been unable to print my boarding passes at my hotel for my return flights, and with the app that becomes a non-issue.
As noted above, I cannot compare this app to the apps from other airlines, but judging it in isolation, I love it. Also, I don’t anticipate needing to buy tickets from the app. I cannot imagine searching for flights on the small screen of a phone. I’ll use a computer or tablet for that. For me, an airline app is for use on travel day. And this one is very cool. Five stars.