Oh the premium cabins are not immune. I got the "shoes off" frisking today and yesterday. One way a UA employee (not the ticket taker) sent me, and the other, the rent-a-security dude got me. I was seated in Row 1 both ways. Yesterday I was particularly pissed off because boarding was "halted" for about 10 minutes (before it really began but after announcement to board) and they could have started some screening. Instead, by the time I got on board, the F overhead bins were just about completely full.