Chris's links : Travel : Airlines/Flight

American Airlines

British Airways

CheapFlights UK good search for cheap flights

Easyjet

Kayak "Compare hundreds of travel sites at once"

LastMinute last minute cheap deals and auctions

Luton Airport

NetFlights.com Look up cheap flights

Opodo Search for flights, hotels etc

Priceline name your price for air travel, accom etc. must originate in US.

Ryanair

Skyscanner Low cost European flight search, recommended by RRM

Transavia

Travelocity look up flight information and/or book online

Virgin Atlantic

We Fly Good cheap flight search