Planning a trip to India in March 2020 including several domestic flights. I'm surprised that it seems there are few options for first class on domestic carriers. Air India has a separate first cabin on a few of their domestic flights but not the majority it seems. IndiGo appears to have no option. SpiceJet has an "extra leg room" option they call SpiceMax which looks like it's just the exit row and the front/bulkhead row with extra luggage and food. GoAir offers a "European business class" option called GoBusiness at the front of the cabin with the middle seat blocked on otherwise ordinary economy-style seats with extra luggage allowance and food included.

Are there any other viable options I'm missing? Any thoughts on the SpiceJet or the GoAir offerings? Currently planning to fly DEL-BOM-COK-DEL over the course of 7-9 days. Thanks in advance!

[ON EDIT] Just found Vistara. Doesn't have a great network but certainly appears to have a legitimate First class product on their domestic flights. May change around our travel plans based on their schedules and routes.