I like your photo. Having trouble equating "Lighter Than Air" with "In the air." Maybe the challenge should be renamed since it seems to be a common problem for many entrants.
Looking at the image I don't see anything that meets the challenge description, "Capture objects in the air. Use a fast shutter speed to capture objects off-the-ground in an unusual way. Through your camera, photograph the world in suspended animation unlike you normally would."
Although I am totally in love with this little girl... and the shadows on the bridge... the convincing title does not make it seem to meet the challenge. I'm sorry. It would be a wonderful entry as a Free Study... but not for Objects in Air/high speed stuff. *sigh* 4