FWIW, while it’s certainly a fun parlor game to predict airframe retirement plans, I think it’s a little premature to assume airframes like the 767-400’s will retire at 30. Even the 767-300’s might stick around for a bit as a flex fleet. But I guess we have to start somewhere. The D check schedule will probably weight heavily in the C-suite decision on that.

5 years is an eternity, and it’s really hard to predict what will happen, even without world events potentially impacting plans. Burning they do keep the 767-400’s around for 35 years, that alone would be a huge impact on WB advancement, much less if they kept the 763’s for longer (less likely).