NATA's Safety 1st Professional Line Service Training (PLST) program sets the standard for line service training. AMR Combs created the first training program for line service specialists in the mid-1980s. In the late 1990s, the Aviation Training Institute (ATI) produced a new video edition of PLST. NATA purchased ATI's PLST in 2000, improved it again, and subsequently introduced it under the NATA Safety 1st brand of line service training tools. That version of the training is used today by more than 900 FBOs and thousands of line service specialists across the United States and internationally.