> Blaming the airport staff who have to optimize for the greater good is quite something.

I don't think it's actually as noble as "optimizing for the greater good", but rather "optimizing for getting through the day in one piece". Which, in my experience, is why (polite + friendly + reasonable + firm) is the right register to use in pretty much every interaction with airport staff. You're asking them to do something (not telling), but your presence is ideally vaguely net positive (friendly, smiling, relaxed), you're asking for something that's within their authority to do, and there's a vague threat that you're not going to back down if they say no off-hand (their day is going to have a larger hassle-increment if they say no vs. if they say yes).

Written out it kind of reads as cold and calculating, but I think every element of it is the best for everyone involved. You don't end up feeling like you just acquiesced to getting screwed by United or Delta, they get to have a nice friendly interaction that ideally makes those 10 minutes of their day suck less than it could have with an asshole customer.

It is the delicate art of being a persistent problem that is more pleasant and easier to deal with than ignore.