The interim report for the Davies Commission was released today (December 17th), with three main options chosen.

It suggests the main way to improve airport capacity in the south-east of the UK is through a second runway at Gatwick, a third runway at Heathrow, or extending a current runway at the latter.

Heathrow's chief executive Colin Matthews said the hub does not oppose expansion at other locations. The hub previously stated it would welcome new runways at both Heathrow and Gatwick.

This choice also means other options, such as improvements at Stansted, have not made the shortlist. According to the report, its declining volumes made it unsuitable, although it may be open for reassessment in 2014.

As for 'Boris Island' - a proposed airport built on reclaimed land in the Thames Estuary by the London mayor - the document mentioned numerous problems, but stated it will take a second look next year.

It said: "While the potential they offered to reduce aviation noise impacts in the south-east of England and to support economic development on the eastern side of London was attractive, they presented many challenges and uncertainties."

Problems included the environmental impact of the location itself and a £112 billion cost, much higher than the three preferred options.