Great question — answering as the UphillTech team:
Airlines communicate with their passengers. Sometimes, in letters (emails these days) and sometimes verbally. In the past (and much of the software that runs airlines is old, or copied from older versions) proper address included a title. You could no more start an email "Dear Kate Gregory" than you could start it "Hey Kate" (as Netflix does when emailing me.) I know for a fact that airlines I use address me formally in emails, and if I happen to speak to a human, they also do. Like while boarding, "have a nice flight Ms Gregory" as they give me the boarding pass back after scanning. The fact that many passengers don't want to be called Mr Whoever or Miss Whatsit doesn't cause the...
Full answer by Kate Gregory: https://travel.stackexchange.com/a/149490 (CC BY-SA 4.0).
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