New Delhi, July 31 -- After spending two decades building India's largest domestic airline, IndiGo is preparing for its next act: becoming a global airline by carrying Indian travellers to international destinations through hubs in India, according to its top executive. "Twenty years have gone into building essentially a domestic airline... That's now our fort," Rahul Bhatia, promoter and managing director of IndiGo, said in an interview with Mint. "The next stage of evolution has to be that we can carry Indians from here, through a hub or hubs, to the world," he added. Bhatia noted that this traffic has historically gone to European, Southeast Asian and Gulf carriers. "That's economic wealth we need to bring back to the country; not only I...