Not sure how mid 717 FO is 6 years in ATL. That doesn't seem right at all. Just a quick glance shows closer to 2 years. Maybe to hit exactly 50.0000000% cracked the 2010 mark since we didn't hire for 4 years after that, but check again its closer to 2 years. And all the other NB ATL positions are closer to 2 than to 6-8. You also compare DL's ATL to SW's non ATL.

ATL-ATL may not be the perfect comparison due to size, but how about just a system across the board comparison. Your methodology seems both off by quite a bit as well as very arbitrary. We have 1.5 year upgrades right now. How about SW?