I flew Air India MAA SIN and it turned out to be my worst flight experience ever. Inordinate delay, dirty seats, dirty cabin, clogged smelly toilets, broken toilet seat.
One good thing tough was food, however the down side to that was - once the food service was over the entire cabin was filled with biryani aroma that clung for the rest of the flight making almost everyone nauseated. PLEASE DO NOT OPT FOR AIR INDIA IN CASE YOU ARE FLYING WITH INFANTS.