Originally Posted by
bethyy
I’ve been searching everywhere but is there any guide to the space or size of bags that can fit under seats in different aircraft?
Which particular aircraft type are you looking at?
There are threads dedicated to nearly every aircraft type here in the AA forum, and for larger aircraft there are separate threads for business and economy sections. That would be the appropriate place to ask this question.
I'd be happy to assist you in finding the thread for the aircraft type you will be traveling on.