Visual bug, amount doesn't fit

See picture:

Lol, What route is that?

That means you have to send it to maintenance after you have handled it. In this case maintenance B.
I like it because you know directly that you cannot send it to any other airport

Like @ICEgamer1705 says, it’s the indication you have to send it to maintenance. In this case Maintenance B on a A380. That will set you back W112.542. As indicated by the minus sign in front of the amount.