I did one time. I had a torn rotator cuff in my shoulder and could not latch my seat belt because of it. Having the extender made it easier because I could latch it in front of me, instead of to the opposite side of my body, then pull it to tighten. Now I just make sure I sit in an aisle seat on the other side of the plane so I can use my other arm to latch the seatbelt.
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