Question: Which one is the biggest airplane in the world?
Disambiguated questions and answers: question: Which one is the biggest airplane in the world with fixed wing?
Which one is the biggest airplane in the world with rotary wing?
Which one is the biggest airplane in the world as being airship?
answer: Antonov An-225 Mriya
Mil Mi-26
HM Airship R100
R100
His Majesty's Airship R100
Natural Questions answer: Antonov An - 225 (from the Wikipedia article "List of large aircraft")