Skip the lines
We recently used the app returning from London. It worked great upon returning to Atlanta. When we got off the plan I asked the person inside if I could use the mobile passport app and she immediately opened the ques and sent us straight to the front of the building. Not all of the attendants were able to process the apps but some were and we had no wait time at all. I highly recommend using the app.
Nbleist about
Mobile Passport by Airside, v1.2.5