It's not quite that easy either. Seats on airliners must be "9G" after the September 11 disaster -- meaning that they have to survive 9G's of force. I doubt it

It's not quite that easy either. Seats on airliners must be "9G" after the September 11 disaster -- meaning that they have to survive 9G's of force. I doubt it would be possible to create seats that would stay in place with even 2Gs of force with latches. Imagine Miracle on the Hudson. Seats may have flown out of their securements, due to the forces in excess of 2G. Or perhaps an emergency landing after an engine failure, which has the potential to be even more forceful. Gimli Glider, anyone?