The National Company Law Tribunal (NCLT) Tuesday adjourned the insolvency plea filed by aircraft engine lessor Willis Lease Finance Corporation against SpiceJet and listed it for July 21. Willis Lease had filed a Section 9 application under Insolvency and Bankruptcy Code, 2016, to initiate insolvency proceedings against SpiceJet on April 12. The engine lessor claims that SpiceJet owes it $6.87 million.