Kinda surprised they're not buying Boeing 737 MAX for cargo. You'd imagine there would be some good deals to be had
The 737 MAX might be cheap, but it's not 25-30 year old plane cheap.
[1] https://www.planespotters.net/airframe/boeing-767-300-n503az... [2] https://www.planespotters.net/airframe/boeing-767-300-n1997a...
That makes sense. However a newer plan also has a longer expected usage and likely lower fuel and maintenance cost.
So looking at absolute cost only doesn't really make sense.
Presumably Amazon crunched the numbers though