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standard websites
cheapflights.com
cheaptickets.com
council-travel.com
europebyair.com for flights within Europe
expedia.com
orbitz.com
priceline.com
statravel.com
travelocity.com
less common websites
airfarewatchdog.com
gadling.com
go-today.com
opodo.com: the Orbitz of Europe
kayak.com
smartetravel.com
thetravelinsider.info
www.travelzoo.com
Skytrax