Heathrow is still causing CTD when this DLC is installed. You plan a flight from Heathrow and load then the game CTD once the blue line gets across the screen.
Removing this software causes this issue to go away.
I have tried removing Asobo's version of Heathrow and still get CTD with your version.
You may not have a way to test your DLC but as consumers we have done it for you and reporting to you that there is a problem so can you please pass these issues to MS and Asbob for consideration.