There was a lot of Colleen's experience in there. But at least she looks and walks like a frail old lady. N looks and moves like a dancer or a gymnast -- on a good day. But any amount of standing wears her out incredibly fast.

Fortunately, the airlines and airports don't care: all they're really interested in is getting people on and off the planes as efficiently as possible, so if you tell them you'll be moving a bit more slowly than the average person they're happy to lend you wheels and brawn to help you move faster.