I think an airbase on land should be a bit cheaper. The biggest advantage is the scrambling ability. But you are not allowed to scramble from land territories. So the usefulness is halved. So maybe airbases on land should cost 8?
I’ve been thinking about this some more, and I have some further thoughts.
I don’t think that UK/ANZAC planes should be allowed to land on Dutch or French territories while they’re still Dutch or French controlled, unless they are at war.
I assume the Dutch have already lost their capital.
How does one declared war on a fallen country?
Unless the UK and ANZAC are at war, not the Dutch or French.