DL and NW flights will align their onboard service starting March 30th. That means meals and timelines for meals will be adopted from NWA, but the food, and service items (glass, mugs, tea service, chine etc...) will be from DL.
Here's a timeline as shared to me by a friend who is an NWA FA:
March 30, 2009: Domestic equipment and product integration with minor
modifications to FC/EY services
April 1, 2009: New flying for pre-merger Northwest crews on Delta routes
June 1, 2009: International service equipment integration with re-branding of
World Business Class (WBC) to BusinessElite (BE)(only minor changes to service delivery processes at this time)