Comment by Ekaros
Virtual interlining is really dangerous model for them and their brand. It basically means that they would be reliant on someone else without any guarantees in case there is delays or problems.
And with different alliances they already have fully functional interlining model. So trying to extend outside this is not beneficial for them.
Well someone at the airline does need to crunch the numbers to figure out at what $X of spend the risk becomes sensible to take on.