round and round
Whew!!! Finally got to the end of the thread.
Here we go round and round in circles.
Conclusion (as SLF): have BP ready to show, if it is not required no harm done. If CC not friendly try another carrier.
Conclusion (as CC): Smile and ask politely for BP. If response is positive & courteous keep it in the memory bank. If response is negative or grumpy then make a withdrawel from the memory bank.
My theory is that showing your boarding pass has nothing to do with security or protecting revenue, but more to do with.....
Mr Plod: "Evening Sir. How are we this evening? Had anything to drink this evening?"
Yes! The only reason for the CC to interact with the SLF when they get on the plane is to establish if anyone is "under the weather". As they say in the classics: Forewarned is forearmed.