India's newest airline Vistara said on Wednesday it had ordered 19 jets from Boeing and Airbus for a combined $3.1 billion as it prepares to launch international flights.

As the country enjoys a boom in air travel owing to its growing middle class, airlines are rapidly expanding their fleets to capture a slice of the market.

Vistara, a joint venture between Indian conglomerate Tata and Singapore Airlines, said it would buy six Boeing 787-9 Dreamliners and 13 planes from Airbus's fleet of A320neo and A321neo aircraft.

“These orders are a landmark step in Vistara's journey and demonstrate our deep-rooted commitment to contributing to the rise of the Indian aviation industry and to offering more choices to our customers," chief executive Leslie Thng said in a statement.