Web sites which are about or which belong to London's major airports belong in this category.
 
 
Recommended Resources
Comprehensive "unofficial" guide to Heathrow Airport in London, England. Find out information about the various terminals, facilities, contact information, lost property and more.
http://www.heathrow-airport-uk.info/
A London airport primarily serving the business community has created this website which displays flight arrival and departure information, options for baggage, details about travelling with children, and the airport’s restaurants and other services. Also shares a primer of how to plan a trip, what to do if one needs special assistance, and how to retrieve or start a search for lost or left luggage.
https://www.londoncityairport.com
This suburban airport serves the London area. The website contains flight information, security rules, customs requirements. Airport parking services are all explained here. There is an interactive utility by which travelers may book local hotels, a flight, or car rentals.
https://www.gatwickairport.com
Originally called London Airport, Heathrow is an international airport and London’s largest and busiest airport providing passenger and freight service. The website carries information about all flights arriving and departing from Heathrow and displays a real-time board which lists active flights, their status, and which terminal the plane will be using.
https://www.heathrow.com
Provides information about London's Luton airport and flights arriving and departing. There is information on the airport’s security requirements, parking services, and other services available at the airport as well as directions to the airport by drop-off, rail, taxi, or bus as well as other options.
https://www.london-luton.co.uk
Furnishes information regarding London Stansted airport such as departure and arrival flight information, displayed in real-time, the location of the duty-free shop, and other services. Visitors can book a room at the airport hotel, hire cars and find currency change services.
https://www.stanstedairport.com