Of course Mainline would cost/lose more than BACX do if they opened MAN as a base. The a/c are larger and more costly. How how would flying 50 - 60 people to MXP on a A319 or 737 be cheaper than doing so on an RJ? Especailly as Mainline would require 5 crew when BACX only use 3 etc. There is too much competition on most MAN routes so not likely to fill any current BACX routes on a 319/737! The cost of re-opening a BA base at MAN would be huge!