If you are able too get your boarding passes, we print ours so not sure how it works with electronic boarding, then no reason to stop in the front. go straight to the first check point, they look at your passport and ticket. Then go get scanned. Then you just go to your gate and they will check your documents. I don't use any app as it seems like a waste of time. At the gate they looked at my covid test, passport and stamped my ticket. With JetBlue they send you an email with a link. Fill out the form and it gets attached to your ticket. No need for paper forms. You can always get the form before you fly out as well and just have it ready. But at least with JB, they were having passengers fill it out online even while in line if they didn't do it already.