If you have GSX installed, try to enable Logging from the Troubleshooting page of the GSX Settings. If you don't have it, there's no reason not to download it, since it's entirely free to use at all FSDT airports and, in fact, if you don't install it, you'll miss parts of the scenery at KLAS, like docking systems.
After you install GSX, and enabled Logging in its settings, if the crash happens again, post the Couatl.LOG and Couatl.ERR files you'll find in the %APPDATA%\Virtuali folder.