Northwest will match your Delta status. I've been very pleased with their platinum benefits. (Versus Delta)
Upgrade any fare
Companion upgrades at gate
Upgraded to Gold Elite in Starwood
If you are tall, the WBC gives the most leg room. However for transatlantic, I think Delta has the most comfortable seats and best food/service. (Of the US Carriers.)
Actually the best for JFK->AMS is Singapore Airways.
The only drawback to NW vs Delta is lounge access. Delta gives a free Crown Room Card to their Plat members.
[This message has been edited by jgoldman (edited 08-16-2002).]