Each indirect air carrier must designate and use an Indirect Air Carrier Security Coordinator (IACSC). The IACSC and alternates must be appointed at the corporate level and must serve as the indirect air carrier's primary contact for security-related activities and communications with TSA, as set forth in the security program. Either the IACSC or an alternate IACSC must be available on a 24-hour basis.
49 C.F.R. §1548.13