Guardian: The case for building a third runway at Heathrow has been challenged by figures showing a significant fall in flights this winter as cabinet ministers join a Labour revolt against expanding the airport. The number of flights to and from Heathrow will fall by 1.9% this winter compared with the same period last year, according to figures obtained by the Guardian. The reduction, equivalent to 25 fewer flights a day, was pounced on by anti-expansion campaigners, who said it undermined one …