The following F/A bases are closing at the same time the SEA base closes:
Seattle, Portland, Houston, New Orleans and Chicago.
These closures make great business sense. They were all small(ish) bases and were remnants of the old days. Seattle was an old Western Airlines base. New Orleans, Houston and Chicago were from the old days when Delta didn't rely as heavily on the hub and spoke model. Portland was open to support the hub that never seemed to pan out. Unfortunately, the crews at these bases are pretty senior folks and didn't have alot of choices in where they could transfer to. Many were just assigned to the Delta New York base which is typically a very junior base for many airlines.