14 CFR § 248.4
Time for filing reports
July 13, 2020
The report required by this part shall be filed with the Office of Airline Information within 15 days after the due date of the appropriate periodic BTS Form 41 Report, filed for the 12-month period covered by the audit report, or the date the accountant submits its audit report to the air carrier, whichever is later.
[ER-1351, 48 FR 32756, July 19, 1983, as amended at 60 FR 66725, Dec. 26, 1995]