I got off of the wheel chair at security and walked right through and sat in one of the chairs waiting for the plane. I was in the wheel chair from check in to the gait and went right up to security. They asked if I could walk through the security gait, and bye bye wheelchair from that point. It was a LONG trip to that gait! Was I grateful.

Yes, tip the porter!

Physical therapy can help with balance....

Repetitive training of compensatory steps: a therapeutic approach for postural instability in Parkinson’s disease

http://jnnp.bmj.com/cgi/content/full/75/12/1682