Crash by Airport expansion request

I played 2,5 Periodes this nice game, no crash no prob, but then i got a question for Airport-expansion, and at this point every possible choice crashes the game.
Please solve the problem, or help me!-

Thanks Ralf

a soloution that did fine for me is mentioned in a steam forum… … 778619389/

by the way… its the same problem i got viewtopic.php?f=38&t=8973