J2 wheelchair cushions.

[SueM in MN]

I was going to find out about the rowho I think you call them. they are used here if your pressure areas are really bad but would do the trick. think they are filled with air although 100% not sure.

Roho cushions do have air.
Here's a US webpage where they sell Roho cushions and show a variety of cushions on one page. Here is also a link to Roho's website. My DD has never used a Roho cushion because the gel meets her needs better (you can sink into it a bit, it helps keep you in place and does a very good job of relieving pressure), but some people with injuries like your son's do use Roho cushions and like them. Even if he only uses it for the plane ride, it would be one less worry.