User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-4969421-20120511145412/@comment-4697011-20120512083520

Yes, normal Rathian can roar airborne too. I've seen it happen many times, both online and offline. As Dark Jinouga said, you have to hit her enough for her to be raged while in the air and hope she doesn't hit the floor.