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 of London Liverpool Street station up to 8 times per hour. The journey to London takes about one hour. A number of other airports also serve the London area. The following are mainly used by general aviation flights. Airports are listed at their current borough, although the area may have been outside London at the time of construction. There were several Royal Air Force stations in London. This list excludes those that are classed as non-flying stations. Station are listed at their current borough, although the area may have been outside London at the time of construction. Due to London's high capacity,