The reason Bronner doesn't want to invest in UAL is the same reason why no one else does. The fundamentals aren't right and the investment would surely crumble under the weight of UAL's still enormous financial burden.
There is another reason that I suspect he's not interested also. Why would he want to save a competitor of his investment (despite the codeshare) when he can pick up pieces of the competitor at decent prices and in the same step enhance the chance of survival of his UAIR investment. Of course there will be no investment unless he can get a competitive cost structure and that issue is still the major sticking point. Nevertheless there will be interesting days ahead.
There is another reason that I suspect he's not interested also. Why would he want to save a competitor of his investment (despite the codeshare) when he can pick up pieces of the competitor at decent prices and in the same step enhance the chance of survival of his UAIR investment. Of course there will be no investment unless he can get a competitive cost structure and that issue is still the major sticking point. Nevertheless there will be interesting days ahead.