Jet engines weigh about 4 tons each, so you might wonder how they get off the ground! They're complex, but all we really need to know is that they're machines that make air go twice as fast. Cold air (1) is sucked into the front at about 1000km/h or 600mph (2), gets squeezed about 90% by the compressor inside and enters the combustion chamber (3). There it burns with fuel that squirts in from giant tanks in the wings (4). When hot air blows out of the back (5), it's going twice the speed as it was when it entered the front - over 2000km/h (1250mph)!
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