A plan for a fourth runway at Heathrow has been sent to a government group looking at airport expansion in the south.
The proposal has sparked anger in the Thames Valley as it's suggested extending the site closer to Windsor. It could also lead to increased flight numbers by up to half a million a year.
Our Transport Correspondent Mike Pearse has been looking at the arguments for and against the extra runway.
He spoke first to Jock Lowe, a former Concorde pilot.
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