Hi there! I'm sorry to hear that you're experiencing unexpected crashes while trying to fly at IAD and LHR in World of Airports. Let's work together to resolve this issue.

To start, could you let me know if you've noticed any specific patterns related to the crashes? For example, do they happen during particular tasks, or is it random? Also, have you tried any troubleshooting steps already, such as changing the graphics settings or restarting the game?

In the meantime, one common fix for crashes is to adjust the game graphics settings. Some users have reported that setting the graphics to "fast" helps reduce crashes, especially in busy airports like IAD and LHR. Would you like to try this? Here’s how to do that:

1. Open the World of Airports game.
2. Go to the “Settings” menu.
3. Look for “Graphics” settings.
4. Change the graphics quality to “Fast”.
5. Save your settings and restart the game.

Let me know how it goes or if you have any other details you can share!