It is a new challenge for formerly government-owned Air India, which Tata Group took over last year. The CCI, Air India and Vistara did not immediately respond to requests for comment. To address the CCI's concerns, Air India could make concessions such as giving up certain routes or reducing frequency, the second source said, adding that Air India remains confident the matter can be resolved by recommending certain changes. Vistara and Air India both fly on international routes such as London and Dubai and would need antitrust clearances in other jurisdictions, the first source said. Air India is expecting similar queries from foreign countries once it applies for clearance there, but is waiting for the India process to first close, the source added.

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Persons: Vistara, Vaibhav Choukse, India's J, Choukse, Aditi Shah, Aditya Kalra, Gerry Doyle Organizations: Vistara, Air India, Tata Group, Tata, Air, The, of India, Singapore Airlines, India's, Sagar Associates, IndiGo, Thomson Locations: DELHI, Air India, India, London, Dubai