Airports are always under construction or undergoing modernization programs. If FeelThere or Nyerges only chose airports where no work was being done all we would get is grass airstrips from airports out in the middle of nowhere.
KMEM was released with major terminal work being done, EDDF is about to be released despite major work being done, and KLAX, KPHL, and KJFK all had major taxiways and other areas built that aren't in the game. KDFW is about to add a new terminal, runway, and taxiways. I'm sure there's more examples and none of this has stopped these airports from being released thus far.
So, there is no "hold up". For your sake, hopefully they'll work on it at some point.