Can't comment about Delta , but with Continental the conventional wisdom that you get better FF seat availability 331 days prior does not apply. Many times they make FF seats available much later. For example, for our WINES cruise in August, a few months ago FF seat availability for Newark-London was almost non existent. I kept checking almost every day. Then , a couple of weeks ago they showed availability in all their flights to London (they have about 5 flights a day)!
