Hello! I can help you with the Fly Delta app not opening. Let’s see if we can get that resolved together.

First, can you tell me a bit more about the issue? For example, does the app show any specific error messages, or does it just freeze or close right after you try to open it?

Being on Android 10, there are a few common solutions we can try that may help. Here are some steps to start with:

1. Restart Your Device: Sometimes, a simple restart can solve app issues.
2. Clear Cache and Data: This can help eliminate any corrupt data affecting the app.
- Go to Settings on your device.
- Tap on Apps.
- Find and select Delta.
- Tap on Storage.
- Click on Clear Cache and then Clear Data.

3. Update the App: Make sure your Delta app is up-to-date. You can check for updates in the Google Play Store.

4. Check Device Storage: Ensure you have enough storage space on your device, as this can impact app performance.

Let me know if you've already tried any of these steps or if you encountered anything unusual while doing so. If the issue persists after these steps, we might look into further options.