Resurrecting an old thread - I'm interested in the legalities and regulations surrounding "differences courses", in particular the Global Classic/XRS to Vision. Just interested in the FAA Part 91 case - do both the captain and copilot need to have done the differences course? I imagine there are insurance ramifications and I'm also aware that is would certainly not be ideal if both crew had not completed the training, but interested in the rules surrounding differences courses. I understand that your licence will still only have BD700 on it - would appreciate any thoughts!