Change your cover photoUpload Change your cover photoUpload MitLiebe This user account status is Approved About About Questions Questions Comments Comments New question New question Why is the aircraft weightless in its up and down movement during the brief moment of weightlessness during parabolic flight? 7 years ago in: Flying & Air traffic 12 comments (0 rating, 0 votes, rated)You need to be a registered member to rate this.Loading...