Delta Air Lines has purchase agreements for 23 SAS MD-80 family aircraft, which the carrier plans to use for spare parts for its own McDonnell Douglas fleet.

The Hartsfield-Jackson Atlanta International Airport-based airline will not say if it plans to acquire more aircraft, but it also has no short-term plans to retire any of its MD-90s, which it has been acquiring at a steady pace to supplement its narrowbody fleet.

Delta now has more than 60 MD-90s, 54 of which are in service. It also has 117 MD-88 aircraft in service.

CFO Paul Jacobson tells Aviation Week the airline has purchase agreements for the 23 MD-80s at “very low prices,” but did not specify the cost.

Delta bought the first SAS MD-80 on Sept. 11, 2012, after it was ferried to Marana Aerospace Solutions, according to the Aviation Week Intelligence Network fleets database. The database also shows that Delta recently purchased a 1997 MD-90 from Boeing, which currently is in Blytheville, Ark., and likely to be parted out.

The acquisitions are part of a broader maintenance, repair and overhaul strategy at Delta, which intends to lower materials expense by “seeking out market and part-out opportunities,” Jacobson says.