Originally Posted by
RandomBaritone
The situation is a little better for the reverse routing. If you plan on taking Mint SFO>BOS regularly, you'll want to invest in an AmEx Platinum, as I just did. It'll give you access not only to the (overcrowded, different terminal, but walkable) SFO Centurion Lounge, but also (via Priority Pass Select) the Air France lounge just around the corner from Mint's departure gate at SFO International Terminal A.
Thanks for the tip about the Centurion Lounge.
In time though Jetblue has to do its own lounge deals!