(Bolded for TL: DR)

Had a family member flying from MEM, connecting via ATL, and terminating in PHF this evening. It took me A LOT of convincing to trust the mobile boarding pass option on her MyTouch 4G - the last time she tried it, we didn't realize that you must check in using the device you'll be traveling with, and she missed a flight while waiting in line for a paper one.

Yesterday, I was trying to help her check in and it was stuck at the "loading" circle thing. I noticed that many people on the Android market (sorry, Google Play ) had similar issues, so I tried signing into the app on my stock HTC Amaze - same issue. After restarting the MT4G, the app finally worked and she was able to check in.

The family member was able to clear TSA and boarding in MEM and was quite happy with modern technology. Unfortunately, I just got a very unhappy message stating that while boarding at B14 in ATL, the e boarding pass didn't pull up. She restarted her phone but that didn't work either - it was doing the "loading" thing once again. She had full signal and was able to checks FIDS data using another app, so there was definitely a live data connection as well. She said that a very friendly Delta gate agent printed out a paper boarding pass, but was quite put off at the reliability issues.

I understand that most people are able to use the app without issues, but there are definitely quite a few people having similar issues on the marketplace reviews and elsewhere. I respect that the Delta app is, by far, the best of any carrier's that I've tried, but there should be some fail-safe built in to prevent anyone from having the same problem. It's quite possible that someone can miss the last flight out after waiting in a long TSA line and finding out that the app suddenly doesn't want to work when they get to the ID check station.

Danny, if you have a brief explanation of what may have caused the issue this evening, and any possible solutions to avoid it in the future, that would be great. If you'd like the PNR, I'll be more then happy to email/PM that.

Thanks!