1) The photo must have been taken in or from the cockpit or cabin of an aircraft
2) If there is no parts of the aircraft visible then the photo must be such that it was obviously taken from an aircraft.
3) Work can be aerial photography as long as it complies with rules 1 and 2.
4) Aircraft defined as being being any Aeroplane, Helicopter, Balloon, Glider what ever, if it flies it complies.
5) Works should include at least a brief description of how/where it was taken.