Warbird is correct but. BUT, on the upload confirmation page there is a frame titled The most visible aircraft on this photo is a:
Helicopter, Blimp/Airship/balloon, Single engine Prop, Glider, Airliner or Other
The category PROP should have been checked also.
Exactly this unneccesary rejections because of obvious errors made me post this thread
Screener Request On Categories (by PUnmuth@VIE May 24 2005 in Aviation Photography)
Hope this helps