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[[Image:Helicopter.jpg|400px|right]]
[[Image:Helicopter.jpg|400px|thumbnail|right|A [[helicopter]]]]
'''Aircraft''' are machines that locomote through the atmosphere. The earliest aircraft were [[kite]]s and hot air balloons. [[Dirigible]]s filled with hydrogen proved airworthy, but there was always the problem of combustion (see [[Hindenburg]] disaster).
'''Aircraft''' are machines that locomote through the atmosphere. The earliest aircraft were [[kite]]s and hot air balloons. [[Dirigible]]s filled with hydrogen proved airworthy, but there was always the problem of combustion (see [[Hindenburg]] disaster).