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One standout tool is Kiwi.com—a flight search engine that boasts unique capabilities. Unlike most flight booking websites, Kiwi allows you to search across entire continents. For example, if you want to fly from North America to Europe, you can input 'North America' in the departure section and 'Europe' in the arrival section. This flexibility can lead to unbelievably cheap fares. While it's advisable to book directly from airlines, Kiwi can reveal great deals that you might not have known existed.