If X bmi pilots do not get through / choose to discontinue / leave the integration.
If Y bmi pilots do not sign the compromise agreement, and as such are Z% more efficient (Z might be negative
) than on the BA scheduling system...
If A BA pilots take up the "part retirement" option coming up later this year. Or leave, die, go Part Time anyway, or tell a Manager what they think of them and are invited to work elsewhere.
And that's before the economy / Govt regs (APD / LHR) and 380/787 delivery schedules...
Multiply X,Y,Z,A etc. in some format and I doubt it equals 0