Fare zones 7–9 are ancillary zones of the Travelcard and Oyster cardfares scheme managed by Transport for London, used for calculating fares from some stations outside Greater London that are not in zones 4, 5 and 6.[note a] Travelcards are available on Oyster with validity in these zones. They are not included in the validity of National Rail out-boundary Travelcards unless mentioned in the Route section as "AAA LDN ZONE 7-9". Fare zones B, C, G and W have fares set by National Rail train operating companies. The fare zones are outside Greater London, typically more than 16 miles (26 km) from Piccadilly Circus.