A consortium of London-based Kalrock Capital and a UAE-based businessman last year agreed to pump in 10 billion rupees as working capital and give funds to creditors of Jet, which was hit hard due to piling up debt in 2019.

PNB, the court-appointed official in charge of Jet's revival, Ashish Chhawchharia, and a spokesperson for the consortium investing funds into the collapsed airline did not respond to requests for comment.

The country's second-largest state lender PNB argues that Jet's court-appointed rescue official had initially accepted its claim of nearly 10 billion rupees ($137 million) from the airline's backers, but then reduced it by 2 billion rupees, according to its tribunal filing seen by Reuters.

At the National Company Law Appellate Tribunal, PNB argued that a reduction of the amount was arbitrary and illegal.

On Thursday, the tribunal agreed to hear PNB's case, Additional Solicitor General of India, Aman Lekhi, who argued for the bank, told Reuters. The case will be heard on Sept. 21.

"How PNB has been treated is wrong - both substantively and procedurally," Lekhi said.

Once India's biggest private carrier, Jet Airways was crippled by losses and a pile of debt as it attempted to compete with low-cost rivals and was forced to ground all flights in April 2019, putting at risk https://www.reuters.com/article/jet-airways-debt-workers-idUSL3N21X2V4 its lessors, suppliers, lenders and thousands of employees.

Jet's resolution plan was approved last year by its financial creditors. PNB has maintained that since the resolution plan mandated only minimum payment of liquidation value for dissenting creditors it was left with no choice but to approve the plan.

(Reporting by Aditya Kalra and Abhirup Roy; editing by David Evans)

By Aditya Kalra and Abhirup Roy