First off, I believe First Air in Canada actually has a 767-200F, not a 757. Anyway, I understand where you are going, but you need to follow OYS' advice and look at what arbitrators are ruling. You can state your opinion, but that really doesn't matter compared to the people who actually make those decisions. They are NEUTRALS, who look at the total picutre. If First Air was merging with Air Canada, I really doubt their pilots would be merged into the top of their combined list. But, maybe a few of their guys would. That is what you fail to see, is that arbitrators may throw a few Airtran guys near the top (probably not the top), and then blend them in at some ratio, probably comparable to SWA's size vs Airtran's size. Look at Nicelau's decision at USAir. The top 500 were all USAir East, because they flew A330s and 767s to Europe, and AWA didn't have those types of Operations at the time. The rest of the group was pretty much merged in relative from that point down. AWA was smaller than USAir, but still got that award. I see that SWA is bigger, and has higher profits, but Airtran is NOT in BK, and does have the same type planes (which takes away the USAir --INTL top 500 comparison for you).
Look to the recent past (arbitrated awards), to see what could be in store for any arbitrated list you may have. ALPA knows this, and I think others may be starting to wake up to that fact too. Remember, your airline is bigger, and you could have big ratios between pilots, but there might be a lot more Airtran pilots in higher spots compared to that first offer.
Bye Bye---General Lee