Must have app for US foreign travelers

My family & I sailed true customs in 5 minutes. We went to a different line to get through customs. There was only one other family ahead of us who had the Mobile Pass app. The customs officers knew what to do with the app/phones & our passports and were very friendly.
It was fast and easy at the airport arrival because we were basically the only family using it. If there were more people they would need more scanners at the final exit after picking up baggage (there was only one scanner there).
I highly recommend this app for frequent foreign fliers!!

Abaci about Mobile Passport by Airside, v1.2.5