Exiting the aircraft. I always wondered about that, given that - strangely - the rear of the aircraft arrives at the same time as the front. Not unlike driving on the highway, you can only go as fast at the car (person) in front of you. I've considered designing an aircraft that has individual trap doors beneath the leg area in front of the seat. It could be activated by the impatient passengers and would allow them to plummet the ten or so feet to the tarmac where they could then sprint to the terminal, thus avoiding the horrendous, tortuous overhead baggage wrestling and deplaning contest that has plagued the industry for decades. 'Cause Mister Important always has somewhere to be!