Scott's Cheap Flights
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Dollar Flight Club delivers cheap flight alerts that can save you $500+ on your next international or domestic flight.
They search across hundreds of airlines and travel sites, from major booking sites to individual company sites, to give you as many cheap airfare options.
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Hopper analyzes billions of prices daily to predict how prices will change and tells you whether to buy or wait.
Kiwi is an online travel agency specializing in combining flights and other forms of transportation into a single booking to get you where you need to go for a low price.