Just to share as a data point. Booking LAX-JFK in March using points. Mosaic 3.

Blue flights are around 10.6-11K on the low end, Mint ranges 60K-90ishK. Mint is $768 when around 60K points.

Had to book and cancel flights to figure out the mint cert requirement, annoying but whatever.

Flight where mint was $988/90K ish points req'd 3 MTM.
Flight where mint was $768/60K ish points req'd 2 MTM, so I booked that one.

I feel 1 cert JFK-LAX does not exist because the econ fares are super low and this is mid-week low season. Mint cabin is empty.
Overall I'm happy though, paid 10.6k miles for mint.

One question, can I move to to an earlier flight and keep Mint if there's a seat open? I booked the latest flight that day. You can't do that w/ the legacy carriers when you get upgraded.