Originally Posted by
easterlywinds
Given that the chance they agree to it if you ask is zero, it's by definition more likely to bring you the desired result. I stand by my recommendation.
I did not say nobody would notice, rather it bypasses the issue of the cultural norm of being unable to agree to any bending of the rules, regardless of circumstance.
Given you think it's "rude", "extremely entitled" and "discourteous", I wonder if you could explain who exactly is negatively impacted by this change. Is anyone gaining an unfair advantage
I'd also urge you to run the hypothetical in your mind - if two passengers in Y were to swap seats, would you feel the same?
Or if two people in a movie theatre voluntarily switch seats?
Do you operate your life and moral code to be an exact mirror of the rules and regulations around you?
Anyway, feel free to present your own opinions on the question at hand, but there's really no need to resort to ad-hominen. cheers

The chance that they say no when asking is not zero, you got a somewhat weird no but one data point is certainly not the opinion of all crews.
There was a couple of cases where ANA managed to take of with a mismatched passenger count, one heading to the US and they returned to Japan. The rules for passenger count and matching was strengthed by the Japanese authorities subsequently. You may have noticed that there is a part of the announcement that goes something to the extent of "all passengers need to sit in their assigned seat before pushback". I am not sure the crew will take to positively to find a surprise passenger in the seat. In Y no one is probably going to notice as long as you swap between assigned seats, but in F it is going to cause a bit of a kerfuffle to find the wrong passenger with the boarding pass. It may still be accepted, but I don't think it is one of the rather get forgiveness than permission situations. But that's just my view.