In any event, it's not ps any longer. This website (
https://www.united.com/ual/en/us/fly...-services.html) indicates it's back to LAX-EWR and SFO-EWR only. To be honest, I never understood why transcons to BOS were branded that way (I don't think JetBlue was really that much of a threat, do you?) but enjoyed the upgraded amenities when I did to have to fly there.