"I have sort of issues with my claustrophobia where being on an airplane or if I force myself, to put myself in these circumstances that I kind of, am afraid of, that can be a way to toughen me up."

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We had an airplane, a Beechcraft Baron, that we - I had since 1981. And Annie [Glenn] and I both of had to have knee replacements unfortunately over the past year, and it made it more difficult to climb up on the airplane. We weren't using it that much so we did - it hurt a lot but I finally sold the airplane.

— John Glenn