Introduced in November 2007 dot2dot is an airport door to door shuttle bus service operating into and out of central London to Gatwick and Heathrow airports, thought not between the two airports themselves. Services operate into central and east London as far as Canary Wharf.
A division of National Express  the company uses a sophisticated website and integrated technology provided by Microsoft to match passengers to destinations. National express also bought out an existing shuttle service, Hotelink, and have rebranded that service under the Dot2Dot brand. The company claims that customers will have a maximum of 4 stops (including yours) on any journey into or out of London. Its a shared shuttle service and while you can pre-book via the website you can also simply turn up at their desk in each terminal and have a maximum claimed waiting time of 20 minutes till a bus is available. The service runs 24/7.

to/from Gatwick	to/from Heathrow
from £17 per person	from £15 per person
Rates based on maximum number of people booking, the more people in the party the cheaper per person the ride. The price will also be cheaper if you book a round trip. You are allowed one piece of hand luggage and one case, additional baggage will attract a surcharge. (from £3 per piece).

Safety seats for children provided (3 years and up, if under 3 the child must sit on your lap).
Also special needs can be catered for (pleaser provide 48 hours advance notice).

The fleet consists of 12 seater custom built buses with climate control. They are fitted with all age seat belts.