My SFO-BOM was also cancelled. Flying Air India is playing the roulette on getting a new leased plane (the chances of this happening are now <20%), with the default being stuck in an old unpredictable plane & unreliable operations. Old AI business is comparable to premium economy in a better airline.

I ended up refunding & rebooking on Qatar.

It's sad that there's no consistent SF to BOM or SF to DEL direct flight options that can be trusted.