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: 100,417
DTW: The Center A lounge has showers and is big and busy. The North/South A lounges at the train stations are usually quiet and have more limited hours. There's also a B/C lounge if you arrive on a smaller RJ, but be sure to allow enough time to go through the psychedelic tunnel for your flight, which will depart from a gate near the center of A. All have self service alcohol.
AMS: You won't have a choice. There's one KLM schengen lounge and one KLM nonschengen lounge.
DUB: Ask at check in for an invitation to whatever contract lounge DL is using.
JFK: You'll arrive at T4 and depart from T2 or T4. The T4 lounge has the SkyDeck. T2 has been redone and is better, but I find it depressing. With three hours and preclearance at DUB, you'll have time to try both. Note that you are allowed to use the airside shuttle (JFK Jitney) to go between T2 and T4 regardless of your departure gate; don't let the aggressive employee guarding the entrance tell you otherwise.