In another time and place, yea they would do it just for the asking and the good
PR. But alas, that time and place was a good 40 or so years ago. Things started to change with regard to jump seating, since 9/11 nope. They would not even consider it. Well since you have an interest in Aviation, why not approach a Charter Company or even a Flight Instructor to observe what there day is like for your school project?
When I was a young boy it was common to be brought up to the flight deck, things changed, it made me interested in aviation and a sort of career as a pilot.