Originally Posted by
cottonmather0
I was on a 320 redeye in F last week sitting in row 3 and there was some kind of metal box mounted under the seat in front of me (row 2). I couldn't stretch out and it was a fairly uncomfortable flight for an F ticket where I'd like to be sleeping.
Both the 752 and a320 have these boxes underneath some seats in F (I think they're related to the IFE?). Seatguru doesn't show them and I've definitely ended up in seats that have them and had a similar reaction to
cottonmather0. Others on here may have better recall of exactly which seats have that problem so you can avoid, but as others have noted neither will be great for sleeping.