Hello! I see you're having trouble signing in with your Virgin Atlantic Flying Club number on the app. Let's work through this together.

First, just to clarify: Are you entering your Flying Club number and password exactly as usual? Also, are you using your Flying Club number instead of your email address to log in? Sometimes, the system requires one or the other, so making sure you’re using the right credential is important.

Here’s a step-by-step approach to try:

1. Double-check your Flying Club number and password: Ensure there are no typos, extra spaces, or special characters that might cause issues.

2. Try logging in via the website (on your Windows device): Sometimes the app can have glitches. Visit https://www.virginatlantic.com/flying-club/account/overview and try logging in there with your Flying Club number and password.

3. Password reset: If your password might be an issue, try resetting it using the "Forgot Password" option. Keep in mind, one Virgin Atlantic user fixed login trouble by simplifying their password — avoiding special characters when setting a new one can help.

4. App Reinstallation: If you attempted to use the app and it didn’t work, consider uninstalling and reinstalling it. After reinstalling, log in again with your Flying Club number.

5. Clear Cache and Cookies: Since you’re on Windows with WebKit, clearing your browser’s cache and cookies before attempting again on the web might resolve any stored data conflicts.

If all these don't work:

- Let me know if you receive any specific error messages during login.

- Sometimes, login issues stem from account flags or temporary outages. I can help check if there’s an ongoing issue on Virgin Atlantic’s side.

- Lastly, I can guide you to contact Virgin Atlantic support directly via their 24/7 number 0344 209 2722 or their live chat for immediate help.

Could you please tell me what happens exactly when you try to log in? Any error messages? This information will help me assist you better!