The maintenance division of Delta Air Lines (NYSE: DAL), Delta TechOps, recently expanded its relationship with Sun Country Airlines of St. Paul, Minn., with agreements to provide auxiliary power unit (APU) and component maintenance services.

“As the maintenance and repair organization supporting the world’s premier global airline, Delta TechOps has a highly skilled workforce and tremendous resources at our disposal,” said Tony Charaf, president of Delta TechOps. “The men and women of Delta TechOps deliver a high degree of efficiency, flexibility and service to valued customers like Sun Country.”

As part of one agreement, Delta TechOps will provide exclusive maintenance on the GTCP 131-9B engine APUs for Sun Country’s fleet of nine 737 NG aircraft for five years. A second agreement extends an existing contract through 2018 for Delta TechOps to supply inventory support and service—including integrated component repair and exchanges—for Sun Country’s entire 737 NG fleet. Delta TechOps has been providing maintenance services to Sun Country’s aircraft since 2001.

“During our nine-year partnership with Delta TechOps, they’ve provided the customized solutions we need, along with unparalleled service and the best technicians in the industry,” said Tony Kubit, director of Engineering for Sun Country Airlines. “Their proven expertise in 737 NG maintenance and familiarity with our growing fleet made them the obvious choice to provide our APU maintenance and component services going forward.”