Hello! I'm Benjamin Carter, and I understand you're experiencing an issue with the British Airways app crashing after login on your Android device. Let's work together to troubleshoot this.

You've mentioned that you've already reinstalled the app and cleared the cache, which are great initial steps. Here are a few more suggestions we can try:

1. Clear Cookies: Sometimes, cookies can interfere with the app's functionality. Please go to your device's settings, navigate to the "Apps" section, find the British Airways app, and clear cookies and storage data.

2. Check for Updates: Android apps can have updates that fix bugs. Please check the Google Play Store to see if there's a new version of the British Airways app available and install it if there is.

3. Network Connection: Ensure that you have a stable internet connection (Wi-Fi or mobile data) as a weak connection can cause the app to crash.

4. Device Compatibility: Sometimes, certain features of apps are not compatible with specific Android versions or devices. Make sure that your device is running a compatible Android version with the BA app.

5. Reboot Your Device: A simple restart of your device can help refresh its resources and might resolve any temporary glitches.

If you've tried all these steps and the app is still crashing, it may be beneficial to check if there are any ongoing issues with the British Airways app server. You can do that by visiting Downdetector for real-time updates on service outages.

Let me know how these steps work for you, and if you're still running into issues, we can explore further options or escalate to higher-level support. Are you satisfied with the suggestions I've provided?