FMSCA Regulation 369.11
369.11 Quarterly reports of passenger revenues, expenses, and statistics.
Commencing with reports for the quarter ended March 31, 1968, and for subsequent quarters thereafter, until further order, all class I common and contract motor carriers of passengers, as defined in 369.3(a), shall compile and file quarterly reports in accordance with Motor Carrier Quarterly and Annual Report, Form MP-1. Such quarterly reports shall be filed in duplicate in the FMCSA Office of Information Management at the address in 369.6, within 30 days after the close of the period to which it relates.