This is the answer for @Pfaff_JTull asking "What about SP-17 to SP-20?"
Saar, can you elaborate more? What is DAL? Or did Anantha mean HAL?
Is 30 months the timeframe to deliver the four trainers? I doubt that.
Rakesh Ji, According to the article DAL is Drawing Applicability List so AK meant DAL only. And according to the article DAL(Drawing Applicability List) or the build-standard of eight trainers in the FOC version will be ready by February 2019 and the first plane will be likely available to IAF by September, 2021.
The likely scenario would be as per the article
2021-2022 Trainers production
If HAL delivers up to SP-16 this financial year and 16 SPs next then they should certify and start MKIA deliveries in 2020-2021 otherwise according to present orders the line will be idle between 2020-2021 since trainers will be available only by September 2021. At the same time SP-21 will be available only by October 2019 and I doubt on the possibility of producing 16 aircraft after that in 2019-2020, the MKIA too is expected to have first flight only in 2020-2021
So actual/possible scenario could be
2021-2022 SP35/SP36 + Trainers production
MKIA after that
I really hope I am wrong and things happen sooner