Its a loan, plain and simple. They haven't invested anything at this point. It attracts 7.5% interest and is convertible into shares at a later date should Virgin choose to do so. And that won't happen unless the shares are above 45 cents. Why would you! I don't think they will do it anyway. That option would have been open now.
I could be wrong but I believe they had a recent capital raising. Question needs to be asked is why did they have to get a further loan and from their major customer at that to top that up so soon.
I could speculate a number of reasons. Personally, I just think they needed the money and Virgin have too much to loose by not backing them now they have put the ATR egg in that basket.
Good luck to them. But I very much doubt that there is any foundation to the conspiracy reason as to LCC as per the previous post.