IO
If there are airways they fly them - if not they fly IFR in class 'G'. Why do you think N866 between SAM and ORTAC had that ridiculously low base level. They are not restricted to Airways in the UK, and outside the UK nobody's stupid enough to use them for that sort of flying
Droopy
Jetstreams and Saab 340s are pressurised - the others are not.
N866 is now R41 isn't it?????