GST vide Notification No. 09/2020 dated 17th March 2020 determines that the foreign companies in the airline business shall not be required to furnish GSTR-9C. Provided that a statement of receipts and payments for the financial year in respect of its Indian Business operations, duly authenticated by a practicing Chartered Accountant in India or a firm or a Limited Liability Partnership of practicing Chartered Accountants in India is submitted for each GSTIN by the 30th September of the year succeeding the financial year.
https://www.cbic.gov.in/resources//htdocs-cbec/gst/notfctn-09-central-tax-english-2020.pdf