But when patch 4.3 hit, we were disappointed to discover that this marvelous little trick was no longer possible. No matter the angle in flight form, you'd drop straight down as soon as you'd left it, which resulted in an unexpected death for yours truly flying over the border to Un'Goro on an archaeology run. You never really appreciate the laws of physics until they're not there anymore.
But no longer! As of patch 4.3.2, the momentum after leaving flight form is back. Bears are once again able to soar majestically over mountainsides, and I am able to free fall over the Un'Goro rim without going splat on the border. Thank you, Blizzard!