Henra: Just out of curiosity:
Where does the optimisim come from that B Version still equals 2 active carriers ?
Good point. You could assume that one of the drivers for going for only 1 carrier when they switched to C in SDSR was they couldn't afford the converson costs - but I suspect they also took all the savings from not operating the 2nd carrier too. This money maybe unlikely to be found to go back - but we'll see!
It will be interesting (and perhaps revealing) if the number of carriers is not mentioned if the u-turn is annouced tomorrow?