I am glad that your trip went as well as it did. It is obvious that even with all the disability laws in place it is still quite difficult to travel alone in a wheelchair. I am sad but not surprised to learn of the difficulty you encountered with the USO at BWI.
Of all the organizations we have worked with the USO has generally been the least helpful regardless of what our needs were. I am horrified that this agency displays such lack of regard for disabled vets.