... AND the no. of SAIL admin staff is 40+ acc. SAS management. None of which would be needed if the 9 a/c would be operated by SAS themselves. So they are an financial extra burden that need to be outweighed by lower crew costs.
I’m no financial expert but I fail to see how the “saved” crew cost of crews for just 9 a/c will outweigh the 40+ admin cost.