Question: which one is the biggest airplane in the world
Answer: Antonov An - 225 Mriya 19881221 ! 21 December 1988 Generally acknowledged as the largest airplane in the world , the single Antonov An - 225 is the world 's heaviest aircraft ever ( maximum takeoff weight greater than 640 tons ) and the largest heavier - than - air aircraft ( in length and wingspan ) ever entering operational service .