Passengers who boarded a Delta flight to Las Vegas at JFK airport at 10:30 a.m. yesterday had plenty of time to catch up on their Sudoku, because they ended up being stuck on the plane for over 7 hours. The flight never left JFK due to scattered thunderstorms on Sunday. Passengers were placated with water and “warm Sprite,” according to one account, and were finally permitted off the plane sometime after 5:30 p.m. A Delta......