needing cash to rent a gate?

[dskluz]

The game is telling me I do not have enough cash to rent a gate, but it only seems to happen when I try to rent at airports where I already have gates. At the moment my bank balance is at about $2 million in the hole. (world is just getting started.) This has never happened to me, at least not for a long time - I think that when I first started playing AM you needed cash to rent gates, but the rule was changed - so I was wondering if anyone can explain this, or is it a bug, or what? I can't seem to find any mention of it on the forum.

[dktc]

You can rent gate when you have negative cash, up to a certain % of your airline value. However, that is only limited to airports where you do not have gates at. If you have exhausted the slots of your gates at your hub and you have negative cash, there is nothing you could do but wait.