In the old days booking a flight was very simple - choose where you want to go, find out which airlines fly there, and contact the airline or your travel agent to get the cheapest ticket that suited your needs. These days there is a dizzying array of online travel agents and comparison websites, all claiming to offer the best prices for airline tickets. So how do you know which ones really are offering the best prices?
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Airlines no longer set their prices then wait for the plane to fill up. They constantly monitor their flight loads, changing fa...