Hi there! I understand you’re dealing with a popup on the Aer Lingus app that locks your screen and prevents you from accessing any information. That sounds inconvenient! To help you better, could you please tell me a bit more?

- When exactly does this popup appear? (e.g., right when you open the app, after trying to log in, or at some other point)
- What does the popup message say, if anything?
- Are you using the app on your Windows 10 device via a browser, or is this a dedicated Aer Lingus app on a mobile device?

This info will help me pinpoint the best solution for you. Meanwhile, here are some initial steps you can try:

1. Force close and restart the app: If you are using the app on a mobile device, close the app completely and reopen it.
2. Clear cache and cookies if on a browser: Since you mentioned you are on WebKit in Windows 10, clearing your browser cache might help. In your browser’s settings, look for “Clear browsing data” and select cache and cookies.
3. Update the app or browser: Make sure your Aer Lingus app or your browser is up to date, as bugs causing popups might be fixed in updates.
4. Check for any notifications or permissions: Sometimes apps show important notifications or require permissions that appear as popups. Allowing these can stop the persistent alerts.

If these steps don't work, I can guide you through more specific troubleshooting related to Aer Lingus app behavior. Let me know the details I asked for, and we’ll take it from there!