East Hartford jet-engine maker Pratt & Whitney says it’s investing millions more to upgrade its existing engine-maintenance facilities in Oklahoma City, creating more than 100 jobs in the next several years.

Pratt Vice President Kevin Kirkpatrick said the expansion of its Military Aftermarket Services operations in the Oklahoma City Air Logistics Complex at Tinker Air Force Base will support its sustainment operations at a key logistics hub for collecting and distributing spare parts and other materials to U.S. military outposts globally.

The Tinker facility is where Pratt delivers spare engines and parts to support the Air Force’s maintenance/repair of Pratt’s F117, F119 and F135 fighter-jet engines — the latter whose engine count will double in the next three years. Pratt says it has more than 7,000 jet engines in military service worldwide.

Pratt did not specify a cost and timetable for its Tinker upgrades.

The Oklahoma City-depot expansion is Pratt’s latest in the last 15 years, in which its presence there has grown tenfold, the company said.