This is a feature request;
When an airline 'A' opens a base where there is already an airline 'B' of same alliance, the system should not allow the airline to open this base. When airline A tries to open this base, he should get an error message saying that there is already an airline of the same alliance already there.
It is against AWS rule anyways to do that and most of the time when this happens it's usually a simple oversight of the player. It has happened to me, it has happened to another one of our alliance. By the time it got noticed, he had already half of his fleet at the other base. Had to BK'd... Please lets get this feature.