TAI is the Prime Contractor where AgustaWestland and Aselsan are the major Subcontractors for the ATAK. First T129 was scheduled to be delivered in 60 months and Program to be completed in 114 months. TAI and AgustaWestland have joint intellectual rights for all T129 configurations.

An "Early Delivery" version (designated as T129A) was introduced in 2010 and 9 helicopters were contracted with the start of deliveries in Q4 2012, 15 months earlier than the original schedule. T129A weapon systems will be limited to a 20mm machine gun (aimed via a helmet mounted sight) and 70 mm unguided rockets.