Three hundred travelers started the summer with an airplane nightmare they will not soon forget. Hundreds of Newark-bound passengers sat for four hours on a tarmac in a stifling cabin after bad weather diverted their flight from London in Connecticut and union regulations grounded it there. To make matters worse, passengers said, the plane's generators shut down for the second time, leaving them with no air conditioning and sweltering temperatures that reached 100 degrees. Some people on the inauspicious Virgin Atlantic flight fainted from the heat, said Andrew Porwancher, of Princeton, N.J. One passenger was taken to a hospital, but airline officials said there is no evidence to link this with the flight.
