Originally Posted by char777

Well, even though the lie-flats with any regularity disappeared some time ago, the BOS-SFO route still granted F lounge access as recently as a few months ago. That holdover was certainly an oddity that you wouldn't really find on any other domestic non-p.s. route.

My sense is that UA would probably still like to put lie-flats on BOS-SFO, as well as other transcons. That was rumored to be part of the never-formally-launched-but-much-discussed "United Coast" plan. The problem of course is that UA just doesn't have enough of the right equipment for it with the PW 752 retirements during covid and the perpetual MAX 10 delays. Competitive pressure has changed too: IIRC DL pulled back their lie-flats on BOS-SFO, and JetBlue's Mint may not be as much of a threat now as it seemed to be 7-8 years ago.

Edit: Just looked up the schedule for next summer, and DL is down to 2x some days, while UA will be 7x! Guess the brief p.s. period worked for UA at fending off DL.