Originally Posted by
N227UA
They do "selective" gate check for UA at NRT. Randomly pick some pax for bag check and body check. If you board with the crowd, the chance of being picked is low. However if you're the last pax to board (which I almost always am) or something like that, you'll surely be screened. I understand while all pax for UA are subject to gate screen at ICN, that's only for bag check.
They were doing it for NH12 (NRT-ORD) when I boarded. Didn't look like a serious effort. One person wanding, one tossing bags, and another directing. I just walked on by.