It’s extremely ironic that she’s a flight attendant and put up this much of a fight against a reasonable request.

Personally, I think you were totally in the right. Some people need to learn that they can’t be a jerk to customer-facing workers without consequences. Hopefully none of your other customers saw the interaction, but honestly i wouldn’t have blamed you if i watched it happen while waiting to check out.

Do you have signs posted at the register that say “ID required for credit card purchases” or something similar?

Please do not bring that awful writing style with you from LinkedIn