Let me show you an example of what I mean.

Searched JFK-MXP in PS. The whole way through it shows it as a Delta flight at $1789. When it finally gives me the booking options, the $1789 is only if it's booked as an AZ codeshare through ITA. Booking it on DELTA is almost double the price.

I want to book Delta in order to use GUCs or cheaper MUAs. But this bait-and-switch google flights does on pricing is impossible and I can't force it to exclude AZ codeshares.