Etihad is one of the top airlines in the world for passenger experience. They offer a great connecting point in Abu Dhabi for travel to India and the surrounding region. I’ve used them to travel there as well as to the Maldives and also back from Sri Lanka.
But they also have a strong frequent flyer program of their own, and they are a transfer partner of Citi ThankYou Rewards and American Express Membership Rewards.