Hi there! I see you're having trouble connecting to the Sun Country Airlines app's website. To help you better, could you tell me if the app itself won't load at all, if you can't access certain features like booking or check-in, or if you're getting any specific error messages? Also, are you connected over Wi-Fi or cellular data?

Meanwhile, I can guide you through a few quick steps to see if we can resolve the connection issue:

1. Check Internet Connection: Make sure your Windows device has a stable internet connection. Try visiting other websites in your WebKit browser to confirm.

2. Restart the App or Browser: Close the Sun Country app fully or refresh the website page in your browser and try again.

3. Clear Browser Cache: Since you’re on Windows with WebKit, clearing cache can help remove any corrupted temporary files that might block loading. You can do this in your browser's settings under 'Privacy' or 'History.'

4. Check for App or Browser Updates: Ensure the app or browser version is up to date, which can fix bugs affecting connectivity.

5. Firewall or Security Settings: Sometimes firewall or antivirus software on Windows 10 can block app connections. Temporarily disable these (if safe to do so) and try again.

If you’ve tried these already or the issue persists, let me know, and we can explore advanced options, like checking network settings or server-side problems. Also, if you have error messages, sharing those can help me pinpoint the problem faster.

Looking forward to your response!