Aplane on the ground will weigh:

a)more than a plane in the air
b)less than a plane in the air
c)the same as a plane in the air

On ground weight of plane will be measured as its actual weight which will be given as

now when plane is in air its weight is measured as combined effect of earth gravitational force and buoyancy force both

so weight in air will be given as

here since net effect due to air is opposite to the direction of weight so in air the plane weight will be measure less than its weight on ground.

so answer will be

A)more than a plane in the air

i think it's 35 meters