The Department for Transport in Britain has confirmed the government is considering plans for a high-speed rail link between Heathrow and Gatwick airports.
The line, which would mainly be underground, would allow passengers to travel between the two airports in 15 minutes.
Currently Heathrow and Gatwick are linked only by road, or by travelling into London and back out again by rail.
The Greater London Transport committee says it would increase the capacity for flights in London and South-east England.
