You make statements like completely false not knowing who people are and what knowledge (generally) they have.
That's completely incorrect. I have a solid history (many years, several user IDs) of correctly predicting the direction of DL's fleet. I'm definitely not Nostradamus. Instead, I use known facts, carefully evaluate each rumor and use logic to rationalize things. And yes, I've been on here long enough that I generally know who has inside knowledge and who doesn't (and checking a posters' history will usually yield this). The persons who have inside information no longer post here, although they sometimes leak it to other posters.
If the 339 were meant to replace the 767s completely why wouldn’t delta just say that when they ordered?
We'll keep this simple. Several years ago, there were rumblings from credible posters (both here and elsewhere) that the overall maintenance costs of the MD-88 and particularly MD-90 fleets continued to swell. When DL initially ordered the 739, they indicated the planes would be used to retire (among other things) the original NW A320. Suddenly, DL opted to keep these aircraft, as well as several B757 that had been expected to be phased out (later, a few older B757 were kept to replace some A320 that were scrapped largely for parts). Yet DL ordered more B739, and placed several 321CEO orders nearly equal to those of the 739. And then DL issued a RFP for MAX vs. NEO. At this point, I rationalized that DL was planning on replacing the MD-88 and MD-90. Several TechOps employees viciously refuted this, insisting DL was going forward with plans to update the cockpits. But the sheer capacity on order, for delivery in a short time frame, told a different story.
But yet most a.netters stuck to the claim: if the A321CEO were meant to replace the MD-88/90, why didn't Delta just say that when they ordered? Well, given the capacity, they kinda did. Nor has DL ever published a comprehensive fleet plan.
Have you calculated potential new routes. Change in mission profile, change in spare consideration. Overall growth plans? I will continue going with what delta has stated that the 339 are slated to retire some of the 767 frames.
I addressed this in my previous postings. You realize that we're in the middle of a pandemic and it will be several years (2024-2025 by IATA's projection) before we reach 2019 levels? 49 shiny new widebodies will be on property by 2025. That's a lot of new airplanes in a relatively short time period. If market conditions turn around faster than anticipated, DL can hang onto some of its 763 until adequate replacements are on property. But it's beyond foolhardy to expect a major 763 replacement order (it's already taken place).
ASMs and seat capacity aren’t the only measure or a fleet plan.
ASM is the driving measurement. Welcome to reality!!!!