A. 1. Check app settings: Open the Spirit Airlines app, go to Settings, and ensure the 'Save Payment Information' option is enabled. 2. Clear the app cache: Go to Settings > Apps > Spirit Airlines > Storage > Clear Cache to remove any corrupted data. 3. Restart the app: Close the app completely and reopen it to refresh the session. 4. Update the app: Ensure you have the latest version of the app by checking the Google Play Store.

B. 5. Use a password manager: Consider using a password manager app to store your credit card information securely.