Don't forget B/E lounges at JFK
Your flying Int'l B/E entitles you to use the Int'l B/E lounges at JFK, which are a little nicer than the "regular" Crown Room. With the construction beginning at JFK the lounges are changing, but there are at least 2 B/E lounges and it seems like a ton of Crown Rooms.
DL staff will point the B/E lounge out if you check into the Crown Room. And of course in SEA, you can use the Crowne Room. Your boarding pass will be your pass for all lounges.