The only logical reason for the Juniority difference is that Reserve is relatively not that bad at AA and being a senior NB FO at Delta/United is just that good.

Beyond the different ratios of G4/G2 aircraft at the big 3

I think we have a higher percentage of career FOs who have been hit so many times that they just want their good FO job. 24 years on property and staring down a crappy line in the left seat vs island turns and two days in the right seat of a NB…. I know what I’d take in that situation.

Now that I have some decent seniority I really doubt I will upgrade. Life as a senior FO is pretty good.

I think this is a big part of it.

if this is the case then we should see upgrade times for NB CA drop dramatically in the next year...someone said it is at 4.5 years here, well if this scenario holds water then I could see that number get cut in half. FOs will just a little bit of seniority will start passing on those NYC CA slots in large numbers dropping it to people with 2-3 years on property...but I agree with some other people's post that the WB FO slots that are available in the junior realm in NYC, LAX, and MIA are just not that desirable to alot of people....

I’m gonna take the upgrade but I’m not going to NYC to do it, and i’m going to wait out for some better seniority so im not in the bottom 20%. I think that’s reasonable, other people can deal with that nonsense

Exactly. I'll upgrade, but not for LGA.

I first upgraded in LGA, best decision I ever made… I had 10 CAs below me on the same award so I started out right away on Long Call (commuting from DCA.) Easy commute , drove it half the time. Started holding a line three months later and at that point I’d just drop most if not my entire line every month and rebuild with out of base MU/PM in DCA. Held a DCA award 9 months later.

Sometimes bidding LGA isn’t as bad as it seems. To each their own

I would think that's the primary reason widebody is relatively senior in both seats (for Group IV) at American. The total number of widebody pilots (CA + FO) at AAL is currently 2,787 out of 13,891 or roughly 20%. I imagine that number is much higher at UAL and probably somewhat higher at Delta. Maybe someone has those numbers for DAL and UAL.