Web sites which are about or which belong to London's major airports belong in this category.
Regular Websites
Comprehensive "unofficial" guide to Heathrow Airport in London, England. Find out information about the various terminals, facilities, contact information, lost property and more. - Heathrow Airport UK
http://www.heathrow-airport-uk.info/
London airport that serves the business community primarily. In addition to flight arrival and departure information, there is information on the airport’s restaurants and other services. - London City Airport
http://www.londoncityairport.com/
Suburban airport serving the London area. Flight information, security rules, customs requirements and airport parking services are all explained here. - London Gatwick Airport
http://www.gatwickairport.com/
London’s largest and most busy airport providing passenger and freight service. There is also information on all flights arriving and departing from Heathrow and other information. - London Heathrow Airport
http://www.heathrowairport.com/
Provides information on London's Luton airport. There is information on the airport’s security requirements, parking services, and other services available at the airport. - London Luton Airport
http://www.london-luton.co.uk/en/
Provides information on London Stansted airport including live flight information and other services. Visitors can book a room at the airport hotel, hire cars and find currency change services. - London Stansted Airport
http://www.stanstedairport.com/