These rule operate in three dimensions while only physically using two, height being indicated beside an aircraft. Different types of machine gun are taken into account, and the skill of your aircrew is paramount. The system also caters for game balance to ensure that no game is a walkover. There are simple rules for ammunition expenditure and players can handle about 4 planes each. An added feature appropriate to the period is the availability of Luck, (assuming you are lucky enough to get any).

The rules are supplemented by data for over 150 aircraft and variants from World War One, for 9 nations and three theatres. The aircraft factors illustrate the differences caused by new designs. The rules incorporate a number of options to make life even more exciting for the unwary, including obsolescence and unreliability. An optional campaign system is provided.