Just think of how many more people could cram into each subway car if there were no seats! That's the idea behind the latest MTA plan which WNBC reports will bring flip-up seats underground. The seats will be unforgiving during rush hour, as they'll be locked in the up position. Hmm, this isn't going to help the different lines raise their grades! The pilot program will feature the seats in 4 of 10 cars,......