Delta and Malaysia Airlines are severing their frequent flier partnership effective May 1, 2014.
You can continue earning SkyMiles on Malaysia flights or Enrich miles on Delta flights until April 30, 2014. The last ticketing date for using miles on awards on each others dates is April 30, 2014, but the travel can be completed as far out as the schedule exists.
Malaysia Airlines joined the Oneworld alliance on February 1 this year and American Airlines is their obvious US partner due to this.
You can access Delta’s web page for Malaysia Airlines here.
The end of partnership between these two airlines didn’t come as a surprise due to both being in different alliances.