Some good points are being made but let's not forget that "most" pax couldn't really care less if they have to be bussed to an aircraft.
It is not acceptable for long haul passengers to be bused especially when there is a very simple solution. If AA go along with this for cheaper fees it says a lot about them as they would not tolerate at many other European airports. In fact they are prepared to pay more to get the service levels they require. Is there any difference between T2 and T3 (only being in 1 and 3) as I can't imagine why AA wouldn't move back if asked.
This goes back to the problem of airport facilities and then MAN are trying to attract all these big carriers.
Perfectly fine to pack any of the budget airline passengers onto buses.
Many would say that AA product at MAN is bad enough and adding this can only do more harm. I mean would MAG offer Emirates the same deal and do we think EK would accept it. Not a chance.