London Underground ticketing London Underground ticketing The London Underground metro system of London, England uses a mix of paper and electronic smart-card ticketing. London Underground uses Transport for London's Travelcard zones to calculate fares, including fares on the Underground only. Travelcard Zone 1 is the most central, with a boundary just outside the Circle line and Travelcard Zone 6 is the most outlying zone covering any of Greater London and it includes London Heathrow Airport. All of Greater London is covered by zones 1 to 6. Tickets including zone 1 are usually more expensive than those involving only outer zones. The most popular
Airports Commission interests, when invited to complete the Airports Commission's Register of Interests. London, with six commercial airports in its metropolitan area, has the world's busiest airports system. However the question of how to expand the capacity of the system to cope with growing air travel demand is an issue that successive governments have failed to address since the 1950s. A previous commission – the Commission on the Third London Airport chaired by Eustace Roskill – sat between 1968 and 1971 and recommended that a site at Cublington in Buckinghamshire (to the north west of London) should be developed as London's third