Block some airline

I already unlocked all the slot on my airport and now after the new update I unlocked all the s/m airlines but now that I’m starting to unlock L and X airlines I have an issue: the waiting line (the plane that are waiting to land) is full of S and M.
I think that a great features is block the airlines that you want, so you can manage the airport like you want.

I think you were suppose to not open S and just L or X to avoid the smalls coming in. Idk