The Times highlights the possibility that if sold off by BAA, Gatwick could soon move to expand to having a second runway:
In 2003 the Department for Transport published possible locations for a new Gatwick runway, to the south of the existing one. The new runway would almost double the number of flights to 486,000 a year, 10,000 more than at Heathrow last year.
BAA signed a legal agreement in 1979 with West Sussex County Council in which it agreed not to start building a new runway until 2019. But this could be overturned by Parliament.
Certainly the expansion of Gatwick would make more sense than Heathrow, though this site continues to argue that a Heathrow-on-Sea option is the best direction of commuters, business and London.