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This report in DW.com looks at the problems behind the suspension of all operations at India's Jet Airways. 

Jet Airways faced little competition in its early years in the early 1990's and was a success as a full service airline competing with state controlled Air India and Indian Airlines. By 2005 the emergence of low cost carriers operating on thin margins and using a cost efficient model of operation hit Jet Airways hard. It still operated as a full service airline failing to change its model to tackle a cost conscious growing Indian market. The $500 million used to acquire a weak budget airline Air Sahara was a costly move leading to a writeoff of the entire investment and a lost opportunity to adapt Jet Airways to the new cost efficient models roiling the airline industry in Asia. 

It is difficult to operate in a environment where a depreciating rupee could add an additional burden from volatile oil prices for cost of fuel to operate. Airlines that operated on razor thin margins such as Indigo and SpiceJet used cost and efficiency parameters as key to flying passengers. Jet Airways failed to make this the priority, continuing to operate as a full service airline. The favorable oil price environment for a brief period in 2015 was not used by the airline to streamline costs. 

Add to this the effect of Goods and Services Tax which increased costs by 18%, the effects of demonetisation in reducing passenger ability to buy with cash, and the 5% tax on jet fuel in 2018, creating a financial crisis at Jet Airways. 

In the end banks decided not to extend further financing for the airline to operate and looked for a large buyer.