I remember standing up to board my flight home, putting the phone into my pants pocket, except I was putting it into air, and it landed on the tile floor of the boarding area. The outside screen wasn't cracked, but the LC-Display cracked all across the bottom, making the display totally black. I usually don't bother having physical boarding passes, but luckily I did have it in paper format at that point.
Interestingly the phone was still working, it just can't show anything. Double-clicking the power button still opened the camera app, and I could take pictures by pressing the volume down button. And alarms would still go off, but holding the power button opened Google Assistant and it understood the command "Delete all alarms", no unlocking required.
I reluctantly use mobile boarding passes when traveling because I don't have a convenient printer when I'm not leaving from home. But presumably the counter could still look me up via my passport or other relevant ID.
Interestingly the phone was still working, it just can't show anything. Double-clicking the power button still opened the camera app, and I could take pictures by pressing the volume down button. And alarms would still go off, but holding the power button opened Google Assistant and it understood the command "Delete all alarms", no unlocking required.