Interesting points there Yog and in a way you've partly answered your own question. I don't think BA mainline pilots do have anything to lose by actively supporting BACX joining the seniority list. BUT, management on both sides don't want it because it means more rights for you, more cost for them. So where do we go from there? Too many of your colleagues grossly over-estimate the influence BACC has within BA. They believe that BACC will wave a magic wand and you'll be on the list. The truth is that management resist almost any initiative from BACC, even zero cost ones, so the only way to force BACX pilots onto the list would be industrial action. I don't actually think that would be legal as you're a seperate company, but even if it was there are a lot of things more important to BA pilots than that which they're not prepared to strike over.
The next factor is that when the last negotiation take place your company council was actively seeking to give our guys the boot out of the regions. Even you must admit that you can't negotiate for a position on a seniority list when you're simultaneously trying to negotiate the removal of someone from a regional position who would be higher on that list.
A final and rather more personal factor is that we're all getting rather sick and tired of the mud-slinging from you and your colleagues. We've had our fill of the lazy, underworked, overpaid Nigel stereotype. We're also particularly fed up of the allegations of arrogance and elitism, selfishness and protectionism which you yourself just levelled. Most BA pilots are at worst ambivalent about BACX, it's no skin off my nose whether you join the list or not. But I'm not going to bang the drum for you when all we get is crap in return.