A prospective flight attendant uses a hair spray during a training session at Indigo Airlines' Ifly training centre in Gurgaon on the outskirts of New Delhi November 18, 2014. (Photo by Adnan Abidi/Reuters)

Prospective flight attendants listen to their instructor during an etiquette training course at Indigo Airlines' Ifly training centre in Gurgaon on the outskirts of New Delhi November 18, 2014. (Photo by Adnan Abidi/Reuters)

A passenger boards an Indigo Airlines' flight bound for Srinagar at an airport in New Delhi November 21, 2014. Picture taken November 21, 2014. (Photo by Adnan Abidi/Reuters)

Prospective flight attendants listen to their instructor during an etiquette training course at Indigo Airlines' Ifly training centre in Gurgaon on the outskirts of New Delhi November 18, 2014. (Photo by Adnan Abidi/Reuters)

Prospective flight attendants listen to their instructor during a training session at Indigo Airlines' Ifly training centre in Gurgaon on the outskirts of New Delhi November 18, 2014. (Photo by Adnan Abidi/Reuters)

An Indigo Airlines' flight attendant talks with a traveller during a flight from New Delhi to Srinagar city November 21, 2014. Picture taken November 21, 2014. (Photo by Adnan Abidi/Reuters)

Indigo Airlines' ground staff stand next to an aircraft after it arrived at the Srinagar airport November 21, 2014. (Photo by Adnan Abidi/Reuters)

An instructor adjusts the neck scarf of a prospective flight attendant during their training session at the Indigo Airlines' Ifly training centre in Gurgaon on the outskirts of New Delhi November 18, 2014. (Photo by Adnan Abidi/Reuters)

Prospective flight attendants walk on a ramp during their training at the Indigo Airlines' Ifly training centre in Gurgaon on the outskirts of New Delhi November 18, 2014. (Photo by Adnan Abidi/Reuters)

An instructor applies make-up foundation on the face of a prospective flight attendant during a training session at Indigo Airlines' Ifly training centre in Gurgaon on the outskirts of New Delhi November 18, 2014. (Photo by Adnan Abidi/Reuters)

An Indigo Airlines' cabin crew member goes over safety guidelines during a flight from New Delhi to Srinagar city November 21, 2014. (Photo by Adnan Abidi/Reuters)

Prospective flight attendants listen to their instructor during a training session at Indigo Airlines' Ifly training centre in Gurgaon on the outskirts of New Delhi November 18, 2014. (Photo by Adnan Abidi/Reuters)

Prospective flight attendants practise restraining techniques during a self-defence course for crew members at the Indigo Airlines' Ifly training center in Gurgaon on the outskirts of New Delhi November 18, 2014. (Photo by Adnan Abidi/Reuters)