And really, regardless of what you can say (or prove for that matter), some employers just flat out won't take SIC time in a single pilot airplane, regardless of what your company was or was not certified for in the past.

But like rickair said, a nice letter from someone up the chain in your former company would go a long way.

I have a couple hundred hours of King Air/CJ time from a 135 department. I logged quite a bit initially as SIC until I found out that almost no one will take it. I never put it on a resume and noted it in my logbook and subtracted the time. Never had a problem with any of the interviews I went to since it was removed.