Senior Vice President and Chief Information Officer Randy Sloan, who led Southwest Airlines’ transition to a new reservation system in May and through technical problems that grounded 2,300 flights last summer, will leave the Dallas-based company in mid-July.

Kathleen Waylon, currently the vice president of corporate delivery, operations and reservations for Southwest (NYSE: LUV), has been promoted to SVP and CIO upon Sloan’s departure, the carrier announced on Friday.

“Randy has built a…