Futuristically (is that a word?), how about this: All airplanes will require GPS. When a pilot, or crew, get into the cockpit, they swipe their personal ID card of some type, and then all information is uploaded and tracked, i.e. aircraft type, day/night, landings, destinations, flight time, etc. Taken further, the airlines could track this information, and when a need arises to hire crews, they could just run a filter of all pilots and send out interview invites. Or, the FAA could send you a nice little notice that you exceeded crew duty limits. Or, worse yet, your spouse could find out that in fact you were NOT on the overnight in Bozeman as you stated as you walked out the door with your roll-a-board.