Since Jet Airways is not operating anymore, if you want business class all the way to PNQ, then definitely Air India will show first option, you can also check the airlines that has tie up with Vistara like British Airways. Even Emirates started tie up with Spicejet, that recently started selling Business class seats. Not sure whether Spicejet have started Business class to Pune. If Jet Airways was there, you would have got many options compared to what is the situation now.