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Why are India's airlines struggling?

Over the last few months, the problems faced by Indian Airlines have been well documented.

Financial difficulties or simmering disputes with staff are a recurrent issue and almost all of the country's airlines are failing to make a profit.

In the past five years they have racked up losses of around $6bn dollars.

All this at a time when passenger numbers are rising - so why is the sector in such a troubled state?

Rajini Vaidyanathan reports.