Originally Posted by
hi55us
Best card is definately the Amex Platinum or Citi Prestige which will earn 5x on Airfare/travel. Both cards will also give you priority pass lounge access that you will be able to use in Boston or Washington.
I prefer B6 E190's to ex-US planes on that route. You'd have to fly that route a LOT to get to Mosaic because they are usually cheap. Ditto to lounge access tho, but in BOS, those flights usually depart from the other side of the terminal. On those short flights I am showing up at the last possible second so not really useful to me.