The budgetcarrier had presented a plan to the civil aviation ministry late last month, but was told to give a revised comprehensive plan with more detail.
The airline was expected to include detail on the proposed investments last week, but that has not been presented, they said.
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The airline's cumulative dues towards AAI have swelled to Rs 240 crore till December 31 last year as a result of the government granting it an extended credit payment facility, the sources said.
In addition, the airline was adding Rs 1 crore each day in the dues since January 1, on account of landing, parking and route navigation charges, they said. Later the credit facility by the AAI was further extended by two weeks on January 1. The airline has already received Rs 17 crore from the investors, which it has used to clear all its dues to the oil companies.