Originally Posted by
dchristiva
Interesting. I was not aware of that. I will have to check the next time I fly with my rollaboard, as it's under the legal dimensions. I don't have any evidence, but I would not have suspected that there would be enough height from floor to the bottom of the seat in front of me to accommodate a bag within the legal dimensions.
It's actually pretty roomy. I've had to put my barely legal carry-on down there once or twice (for reference: UA mainline E-). It might have protruded a bit, but nothing the FA was going to call me out on.