14 CFR § 241.1-1 - Sec. 1-1 Applicability of system of accounts and reports.
Each large certificated air carrier shall keep its books of account, records and memoranda and make reports to the BTS in accordance with this system of accounts and reports. The BTS reserves the right, however, under the provisions of sections 49 U.S.C. 41701 and 41708, to expand or otherwise modify the classes of carriers subject to this system of accounts and reports.