The following rule was written because we were being blind to what the rules actually stated. Now, in a flash of inspiration, it's no longer needed because rule (7.4) states that an air unit on a ground attack mission must stay in the hex of the target. Whilst not explicitly stating, this does mean that an air unit must be attacking from the same hex as the target unit. So you're now free to use the original rules as written (which does the job) or you can use our house rule anyway as it adds a bit of flexibility as to where the air unit can be. This is just a bit of a small clarification, which most people would probably use anyway. In the rules, it states that in the mutual combat phase, ground attack aircraft can be attacked by ground units at normal range modifiers. However, as ground attack aircraft aren't placed on the map, there can be a bit of a discussion as to what this range really is. So, what we do, is to use the range between the current firing unit, and the target of the ground attack aircraft that is the current target of the firer. This means that a marker has to be placed on the map if the target of the ground attack aircraft has already been destroyed. Or to put it another way, when a ground attack aircraft is declaring its target, simply put the aircraft counter in the same hex as its target. This seems to make sense as a ground attack aircraft and its target don't ever use range modifiers, so for simplicities sake, all vertical ranges have been ignored.