One way to split the difference – getting more space while still visualizing on-the-spot what forces are located in a specific territory – would be to forget about blow-up boxes and, instead, to use accessories such as these clear plastic “Fleet Movement Stands” from Litko:
I was interested in these, so I bought a few. I would post pictures but am unable to post images or links at this time.
IMO they are a bit large for use at initial setup, particularly in Europe. But once the aircraft stacks combine they will be most useful. I also think they will be great for the Pacific aircraft carriers. I am happy with my purchase. $28 and I received nine stands in less than a week (shipped to US).