@c174925s
Personally, if it were me having to make such arrangements of a person of such age and physical condition, I would use a luxury RV with a couple of people who could handle the care and switch off the driving to make it as fast as possible.
I say this because just getting to and through a couple of airports can be stressful, time consuming and unaccomodating for some care. At least with luxury road transport, the person could lay down or sit up, eat when needed, get changed when needed, etc.
And if something were to occur, there would be help readily available - a bit more difficult at 30,000 +/- feet.
Most likely there will have to be transport to and from the airport so that takes time and logistics as well but with a luxury RV transport, everybody is already all settled to get from point A to point B with little, if any, change out.
But that is just my personal view and probably one I would make for my own self at 97+ with other concerns.
It's Always Something . . . . Roseanna Roseannadanna