A game like this seems to require a large measure of generalization , making up stories to explain things away , and just basic suspension of disbelief.
If you try to think in terms of concrete tangibles it can drive you crazy.
For example , if a hex on the map represents 200 square yards , then it makes sense that only one unit ( a regiment ? or a division ? ) can occupy one ground hex at one time.
But , in that case , an airport should be five or ten hexes , not one hex. One hex in such a case would represent an airstrip for radio - controlled model airplanes.
Un - usable for anything except maybe a single Fiesler Storch.
On the other hand , if a hex represents ten square miles , then a major paved airport consisting of just one hex makes sense. But then , in that case , you should be able to park an artillery , infantry , and tank unit on a single hex !
What - the - fug ? !
Apparently in a game like this a hex represents neither 200 square yards , nor does it represent ten square miles.
It represents instead ..... well ....
.... maybe best not to think about it ?
Otherwise , to combine generalization , making up stories to explain things away , and just basic suspension of disbelief , we could speculate that the funny business with hexes above an airport represents the fact that aircraft are generally high - maintenance. After returning from a mission , aircraft not untypically not only need re - fueling , they need repairs , or even over - hauling. Or the mission took ten hours in real time , and the pilots need a short , or even a long , break.
Or , obviously , five units of aircraft of 20 or 40 aircraft apiece cannot take off from a single runway at one time. Instead , unit A uses the runway to take off from 1: 00 PM to 1 : 45 PM , then unit B uses the runway to take off from 1:45 PM to 2:30 PM , and so on.
Of course all of that doesn't quite , or doesn't really , explain why an aircraft that was in range last turn isn't in range this turn.
Oh well.
But to answer your question ; I would prefer it if distance were calculated from the single airport hex , not from the hex the aircraft arbitrarily happens to occupy above the airport hex. --- But then an artillery unit , infantry unit , and tank unit should be able to occupy , or at least attack out of , the same hex ?
Ugh , it reminds me of the multiple - core - issue ; is this tweaking the game , or a major re - vamping of the game ?