A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 100,413
If you move to DL, your regular AmEx Plat charge card gives SC (= DL lounge) access when flying DL the same day, including use as an arrivals lounge in airports where security lets you get to the door.
Your GM status (normally 50,000 status miles and $6000 spend required) also gives access to SCs and SkyTeam partner operated lounges when flying a SkyTeam international itinerary, even in coach or on award tickets. GM also can get you into lounges when flying bilateral partners such as VA and VS, but the rules are more complicated regarding who can use which lounges.
If you try to split your MIA-BOS tickets rather than purchasing RTs, be aware that you will pay two change fees if a trip is cancelled.