The government-appointed Commission into airport expansion has revealed its shortlist of preferred options. It lists a third runway at Heathrow and a second at Gatwick in Sussex.
The Commission, chaired by former FSA chief Sir Howard Davies stopped short of listing Stansted for possible expansion.
The Commission's preliminary report said only one extra runway would be needed in the south east before 2030 with an additional runway likely to be needed by 2050.
Plans for a hub in the Thames Estuary - dubbed "Boris Island" were not shortlisted because of "too many uncertainties and challenges".
It said it would undertake further study of the Isle of Grain option in the first half of 2014 and "will reach a view later next year on whether that option offers a credible proposal for consideration alongside the other shortlisted options".
US officials investigating the fire on a Boeing 787 Dreamliner jet at Heathrow airport last week are focused on how condensation in the plane and a possible pinched wire in an emergency beacon may have sparked the blaze, Reuters reported, citing an unnamed source.
The US Federal Aviation Administration (FAA) said it will call for inspections of the beacons made by the Fortune 100 firm Honeywell, but stopped short of requiring airlines to disable or remove the devices as the UK's Air Accidents Investigation Branch recommended.
The FAA said inspections should ensure wires are properly routed and should look for pinched wires or signs of unusual moisture or heat. It gave no further details on how those factors may have contributed to the fire.
But a source told Reuters that investigators had found a pinched wire in the casing of the emergency locator transmitter (ELT) on board the Ethiopian Airlines flight.