Removing the diaper, ridiculous. How is that a weapon?
Funny enough, "Grandma Got Run Over by a Reindeer" popped in my head when I saw the thread title and then there was the parody video.
Apparently Grandma had peed in the diaper so it had that bump that diapers with superabsorbent material get when the superabsorbent polymer expands as it absorbs liquid.
I think making her either remove her diaper or not fly is unconscionable, but if you ever need to travel with one for either yourself or your baby, make sure you have some spare dry ones on hand.
Imagine what's going to happen when the 95 year old grandma with leukemia who has to ride in a wheelchair, BTW, can't hold her pee on the plane and is flying without her Depends. It would be humiliating for the grandma and I know I wouldn't want to sit in that seat after her for the next leg of the plane's journey.