This is the world's biggest plane named STRATOLAUNCH. The aircraft which has a wingspan longer than a football field.
The aircraft traveled 25 knots (28mph/45km/h) down the runway under its own power for the first time firing six Pratt and Whitney turbo fan engines each weighing 4000kg.
When the whole test on the plane is concluded, it would be used to launch satellites and other objects into space.
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From @robinephy