Can I ask something, what's so important about one of Glasgow or Edinburgh remaining under control of BAA?
As far as I can see if Glasgow was sold, the biggest loser is likely to be Prestwick as the new management are going to want to boost passenger numbers (and in the short term, that is likely to be Ryanair, although PIK getting shot of Ryanair could work well for it, if, and it's a big if, new airlines could be attracted, but that's a discussion for another page).
On the other hand if Edinburgh was sold, BAA are likely to raise a higher instant price, which in the short term is attractive to the seller.
To be honest it seems is if the age old "which is better? Glasgow or Edinburgh?" has reared it's head...