What movement of the object fallen from friction-free plane in the flying aeroplane?

Question

object is put suddenly on the horizontal friction-free plane from outside aeroplane while the aeroplane itself is flying to east horizontally. assume no air friction. parabolic or linear movement ?

Answer 1

it will fall straight down , but appear to fall at an angle if observed from the plane

Answer 2

If gravity is operating then it will be parabolic because a square is involved, If the horizontal plane doesn't let the object move under gravity's influence, then it will be constant linear motion. I can't tell what the "horizontal" plane means.