Slightly adjacent to the topic:

I recently booked and flew TK on BOM-IST-COO-ABJ, credited to AI-FR. The other viable option for me was ET, which offered lower earning ratio in Y.

I may have a couple of J trips in the near future and would opt for ET over TK for the basic reason that they credit 200% compared to TK's 125% / 150%..!

For BOM, there is also an option of MS on their B737's.. But not for DEL!