bsprague wrote:
Most airlines will tell you that you do not have the overhead bin space above your seat as guaranteed space for you. All you have that is guaranteed is the space under the seat in front of you. If you are last to board, the overhead bins can be full!
On some airplanes there is very little room under the seats, the space is filled with electronic gear for the rear seat TV's or other things. A friend of mine found this out when switching flights.