I was looking at the ATL 777 B
Last 2 numbers are 2017 hires, in the 12,000s then goes to 2014 hire in the 9000s
The INS list also shows a 2017 hire as 777 B in the 12000s
Maybe they are all instructors?
Most recent ae was a 2015 hire. The 2017s are definitely slis.