Fast track security was very fast, or would have been if they would have let my wife put her cane in a bin, because it wasn't heavy enough to go forward smoothly after the scanners and after scanner agent put it on the extra security side (if it was moving it would have gone through on the regular side), where it sat for many minutes. Admission to fast track only required scanning boarding passes.

No mobile boarding passes allowed.

Oddly, the DL app showed our gate, but the boards at the airport didn't under just before boarding started. More precisely, app showed 27, actual gate was 27A, not the nearby 27B or C.

When boarding started gate agent said print-at-home boarding passes were not acceptable and said we had to go the adjacent counter (next to the boarding door) to have boarding passes reissued and stickers placed on passports (they also scanned our passports, but did not sticker them), then we had to go back to the line, where another agent scanned our passports again and asked us if we retained control of our luggage, etc., then near the door the adjacent counter people rescanned the BPs they had just issued. It was more annoying than time consuming.