Eyeing "tremendous growth opportunities in tier 2 and 3 cities," IndiGo is expected to be part of the government's ambitious regional air connectivity scheme UDAN in a "big way" by inducting the ATR planes.
As per France-based ATR, the 72-600 plane -- powered by Pratt & Whitney engine -- would have 68-78 seats.
The largest domestic airline in terms of market share, IndiGo would be only the third scheduled carrier after Air India and Jet Airways to have ATR planes in its fleet.
IndiGo would have the "flexibility to reduce the number of aircraft deliveries based on certain conditions".
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"Assuming that both the intended final purchase agreement are reached, IndiGo plans to launch its turbo-prop operation at the end of calendar 2017 and expects to induct up to 20 ATR aircraft by December 2018," it added.
The ATRs' low operating costs would help the airline build a large regional air travel network with reasonable fares, Ghosh said.
UDAN (Ude Desh ka Aam Naagrik) seeks to connect un-served and under-served airport as well as make flying more affordable for the masses.
Announcing the signing of term sheet, France-based ATR said the deal is "valued at over USD 1.3 billion at list price".
The airline is currently preparing for an ambitious development of its regional footprint, ATR noted.
The country's domestic aviation market has been witnessing robust growth and sees close to 100 million passengers. It is expected to become world's third largest market by 2020, according to ATR.
"IndiGo is one of the most respected, efficient and demanding airline in the world. Today they have selected the ATR 72-600s as the best solution to effectively implement their ambitious plans to build a nationwide regional network," ATR Chief Executive Officer Christian Scherer said.
During a conference call to discuss the latest quarterly results, a senior IndiGo official said there are "tremendous growth opportunities in tier 2 and tier 3 cities".
When asked about specific plans with new ATR planes, the official said it would be too early to comment on route planning. "We will announce (the plans) in some time," he added.
On the sidelines of an event in the national capital, Civil Aviation Secretary R N Choubey said IndiGo has told the Ministry that it would be participating in the second round of UDAN in a "big way".
At present, Jet Airways and Air India are the only scheduled domestic carriers that operate ATR aircraft.
Jet Airways has 18 ATR planes in its fleet while Air India group has eight such aircraft, according to their websites.
There are 15 ATR 72-500 and 3 ATR 72-600 planes with Jet Airways. The national carrier's fleet has 3 ATR 42 and ATR 72 aircraft.
For three months ended March 31, 2017, IndiGo's parent InterGlobe Aviation posted nearly 25 per cent decline in profit to Rs 440.31 crore as higher expenses, especially steep jump in fuel costs, took a toll on its bottom line.
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