SpiceJet returned 12 old Boeing aircraft to lessors last year, according to the statement. AWAS did not immediately reply to a email seeking comment. India's Director General of Civil Aviation (DGCA) on Wednesday ordered SpiceJet to halve its departures for eight weeks after technical problems raised safety concerns. Lessors typically apply for deregistration when lease agreements are terminated for reasons including non-payment of lease rentals. AWAS filed its request under Irrevocable Deregistration and Export Request Authorisations provisions, which are typically filed after payment negotiations between a lessor and airline fail.