I’ve never found it out for sure, but I always kind of thought that a title “doctor” became because…

It is also inadvisable for PhDs of the non-medical type to book airline ticket in the name of Dr. So-and-so. We know of someone with a PhD in physics who was approached by a flight attendant to assist with a medical emergency on a flight. She saw his name on the passenger manifest and assumed him to be a physician!

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