A Memorandum of Understanding to this effect was signed at the Airbus headquarters in Toulouse, France, by IndiGo's co-founders Rakesh Gangwal and Rahul Bhatia, who is also the Managing Director of the airline's parent firm InterGlobe Enterprises.
The agreement becomes Airbus' single largest order in terms of the number of aircraft, IndiGo and Airbus said in a statement.
While Airbus did not provide the value of the IndiGo order, its website shows the list price per A-320 neo aircraft as USD 102.8 million.
The deliveries of the A-320 neos, ordered in 2011, would start from next year. IndiGo is one of the launch customers for the neo planes which Airbus claims are fuel-savers.
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"This new order reaffirms IndiGo's commitment to the long-term development of affordable air transportation in India and overseas," IndiGo President Aditya Ghosh said.
"The additional aircraft will enable us to continue to bring our low fares and courteous, hassle-free service to more customers and markets and will create more job opportunities and growth. The IndiGo team is energised and excited to herald this new phase of our growth," Ghosh said.