I currently have 200 hours TT, 20 MUlti. I'm working on my CMEL. A friend of mine just bought a CitationJet 3 (part 91 operations), who is also an MEI told me he would like to take me on several over night trips next year when he takes delivery of the airplane. He said he likes to have an extra set of hands. Would it be legit for him to log that in my logbook and call it training?