The Tatas and Singapore Airlines-promoted Vistara said these two flights increases it network to 22 cities and the bookings are already open on these new sectors.
While the Delhi-Chennai operations will begin from February 15, the one between Chennai and Port Blair will be starting from March 1, the airline said in a statement.
The airline already operates a daily direct flight between the national capital where it is based and Chennai, and the same will be doubled from March 1.
Within three years of operations, Vistara has expanded to 22 cities offering over 700 weekly flights, operated by a fleet of 17 Airbus A320s. since launch the full service airline has ferried more than 7 million customers.
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