I don't read Chinese and can't provide you links, so treat this as very anecdotal. But here's what my (Chinese) wife tells me from their news. It seems the co-

I don't read Chinese and can't provide you links, so treat this as very anecdotal. But here's what my (Chinese) wife tells me from their news. It seems the co-pilot was very senior and experienced. But because of the politics of a corporate buyout, he was forever relegated to a supporting role. Job advancement, or even the recognition of his skills, was impossible. He was destined always to be in the right seat. He had complained to management multiple times and given them threats (I'm not sure what the nature of those threats were; likely just to quit?). This came to a head with the crash of the Chinese real estate markets, where he'd had a lot of investment. Basically he lost everything. The story - again, third hand at best by now - is that he left a note before embarking on that final flight.