IndiGo Airlines (6E, Delhi Int'l), Vistara (UK, Delhi Int'l), SpiceJet (SG, Delhi Int'l), and AirAsia India (I5, Chennai) have all announced new routes from Mumbai Int'l after they secured slots vacated by crisis-hit Jet Airways (9W, Mumbai Int'l), The Economic Times has reported.

The Indian Directorate General of Civil Aviation (DGCA) started redistributing Jet Airways' slots for flights between April 16 and July 15 in early April. The authority has already temporarily reallocated around 40 slot pairs at Mumbai, of which IndiGo secured additional 13 slot pairs, SpiceJet - approximately 10, AirAsia India - eight, and Vistara - seven.

The DGCA will also discuss reallocation of a similar number slots at Delhi Int'l.

Jet Airways reportedly had up to 400 unused slot pairs at airports across India. The debt-ridden carrier currently only operates twenty-six active aircraft, around a quarter of its entire fleet. Jet Airways will be given its slots at the two main airports back once it resumes full-scale operations. On the other hand, due to the current uncertainty as to the carrier's future, the DGCA has only approved its limited schedule through April 25 and further slots could become available to other airlines after this date.

Mumbai Int'l is one of the most congested airports in the world with virtually no unallocated slots left. The situation in Delhi is only marginally better.

Meanwhile, investors are thinking over their bids for the struggling carrier. State Bank of India, Jet Airways' main creditor, opened bidding for up to a 75% stake on April 8.

The Business Standard has reported that Etihad Airways is considering investing. The Emirati carrier held 24% of shares in Jet Airways until recently, although its stake has been diluted to 12.5% after the bank-led restructuring. Etihad initially was interested in injecting more capital into Jet Airways, but then decided to sell its stake.

Other prospective investors include government-propped National Investment and Infrastructure Fund (NIIF), TPG Capital, and Delta Air Lines.

The potential investors will have to take at least a 31.2% stake in Jet Airways.