BD-5J Looks awesome, it very small and convenient, it can be carried with yourself to the outdoors and when you will feel bored, start flying =)
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Some general characteristics of smallest jet aircraft: weighs 162 kg, is 3.7 m long, has a wingspan from 4.26 m to 6.55 m (depends of used modification), and can fly at 483 km/h (300 mph).
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see also Largest airplane in world
Some video: