Heathwick is an informal name for a 2011 proposal to create a high-speed rail link between London's Heathrow and Gatwick airports, in effect to combine them into a single aviation travel hub.

[1][2] The scheme envisages a 35-mile (56 km) high-speed rail route linking the two airports in 15 minutes, with trains travelling at a top speed of 180 miles per hour (290 km/h) parallel to the M25 and passengers passing through immigration or check-in only once.

The scheme's success rests on the assumption that a high-speed Gatwick–Heathrow rail link would increase the value of the former's takeoff and landing slots to a point where it will be attractive for low/no frills airlines that presently account for more than half of its traffic to sell these to full-service rivals and move their operations to other London airports Stansted, Luton or Southend.

[3] The aviation and rail industry's initial response has been overwhelmingly negative: British Airways said it would not address the South-East's looming airport capacity crunch, which it said must be alleviated to maintain the UK's global competitiveness.

BAA and an unnamed rail executive questioned the project's success on grounds of technical, operational, political and financial difficulties as well as long time scales.