You are referring to a completely different set of circumstances.

The Feds have stated the rules under which they will allow you to board an airplane. Either you follow their rules, or you drive. There isn't any option. Attempting to irritate them in any way will simply result in additional time spent on your part..........with the possibility of missing the flight if you really get them annoyed. Some forget about the fact that the Feds have quite a bit of power and leverage..........you don't.

With the stores, you absolutely have the option to leave the store without inconveniencing yourself.

In my case, I might show the receipt if I can accomplish it without spending any additional time...........say 10 seconds. The alternative and the potential argument isn't worth the increase in blood pressure.