Can anyone give me an idea of how much it might cost to charter a private plan from West Virginia to Texas?

My Grandmother has Alzheimer's and has deteiorated to the point where she could not make it through the ordeal of flying on a commercial aircraft. There would be no need for medical personel, just my Grandmother, Mom and Dad.

I really don't even know where to start looking for this kind of thing service or telling my Mom how much it might cost.