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by Petrakis 1814 days ago
I think I had the case with jet2, where support for a change of a cancelled flight required my CVV, I called them and told them that I am not willing to provide that information and they should figure out something else. They instantly replied that I can input anything on that form and that it didn't matter and so was it.
1 comments

Which this reply on that SE confirms https://security.stackexchange.com/a/210181