Great app, needs some assistance at airport

I used this app for my arrival from LHR to SEATAC. The app itself is easy to use,quick and handy. The airport was a bit awkward, one didnt pay attention to the special line they had us in, the other walked over specially to let me through. A bit clunky but Im hoping it goes better as more users take advantage of a useful app.

Hanards about Mobile Passport by Airside