> My guess is that "suitable" means the plane can get off the ground with
> it, even if it has to have aerial refuelling at the end of the runway
> and all the plastic seals in the fuel line are eaten away before it can
> finish flying the pattern.  "Superior" would mean that they make a
> little more margin on it than 100LL.  Of course, I could be wrong.
Cynic! :)