kellykeli

Credit rating will go up as your cash on hand stays positive. Just give it some time.

Return gates. You need to have at least 50 slots open at the airport to return a gate though, as each gate provides 50 slots.

I've posted this in the issue tracker as well, so I suppose that this post is obsolete and redundant since this isn't the place for it, but hey pretty picture lol

I'm afraid that flooding routes is a fairly common thing, and that moderators in the past have not done anything about it. Their stance appears to be that it is intentional behavior.

Q: Why does this work?
A: The game controls the maximum amount of gates that you can add to terminals through extending the terminal. The game doesn't make that same check for when you purchase an existing terminal. As such, by selling multiple terminals, then buying them all back at the same time, you are avoiding the 200 gate limit check.

Q: Could someone steal my terminals?

A: Yes, but this process only takes maybe a minute to build a 669 gate terminal, so it's very unlikely to occur.

Q: Let's say for some whatever reason I have a 100 gate terminal at an airport and I plan on closing operations at that airport. If I sell my terminal, would it mean that the spamline at the airport who drove me out of this airport could buy my 100 gate terminal if I sold it and get themselves a 300 gate terminal?
A: Yes, if you don't want others to get your terminal, then demolish it when leaving an airport.

Q: Why would you even need more than 200 gates at an airport?
A: Three reasons:

1.) You are running a hyperspamline and you've ran out of slots before running out of airports.
2.) You operate a boatload of regional jets and you've used up all of the slots.
3.) You are in a long world and natural expansion meant you used up all of the slots.

Q: Why are you sharing this trick? It would lead to more spamlining!
A: Cheers mate