Does anyone know the dimensions of the space that is under the seat in the airplane? I know that some seats have limited space due to the equipment box. I don't like to store my carry-on in the overhead compartment because I always need to get items out during the flight. I also like to use my carry-on as a foot rest. The luggage that I want to purchase measures 9" d x 10"w x 17"h. Thank you.