Airbus Performance
Dear Channel4, i see your based in Munich. I dont know what max take off weights you operate to, or what engines you have but have a close look at that chart again. I imagine it would be very rare that it actually would limit you to Conf 3.
I know for the A320 i've used, MTOW 75500kgs and CFM engines, i would have to be at 40'c degrees centigrade & airport elevation 3000ft before i exceeded MTOW (75500kgs). (A321's , a bit less in temp & elev.)
I would say normally not a problem in Europe.