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
National Airports System National Airports System Canada's National Airport System (NAS) was defined in the National Airports Policy published in 1994. It was intended to include all airports with an annual traffic of 200,000 passengers or more, as well as airports serving the national, provincial and territorial capitals. All airports, with the exception of the three territorial capitals, in the NAS are owned by Transport Canada and leased to the local authorities operating them. As of 1994, the 26 NAS airports served 94% of all scheduled passenger and cargo traffic in Canada. Due to very close proximity to the Province of Newfoundland, the