; guarantee of air traffic services user access (1) Payment under protest (A) In general Any charge or fee that is the subject of a complaint that is not dismissed by the Secretary shall be paid by the complainant air traffic services user to the Corporation under protest. (B) Referral or credit Any amounts paid under this subsection by a complainant air traffic services user to the Corporation under protest shall be subject to refund or credit to the air traffic services user in accordance with directions in the final order of the Secretary within 30 days of such order. (C) Timely repayment In order to ensure the timely repayment, with interest, of amounts in dispute determined not to be correct by the Secretary, the Corporation shall obtain a letter of credit, or surety bond, or other suitable credit facility, equal to the amount in dispute that is due during the 90-day period referred to in subsection (d)(1), plus interest, unless the Corporation and the air traffic services user agree otherwise. (D) Deadline The letter of credit, or surety bond, or other suitable credit facility shall be provided to the Secretary not later than 20 days after the filing of the complaint and shall remain in effect for 30 days after the issuance of a timely final order by the Secretary determining whether such charge or fee is correct. (2) Guarantee of air traffic services user access Contingent upon an air traffic services user’s compliance with the requirements of paragraph (1) and pending the issuance of a final order by the Secretary determining the correctness of a charge or fee that is the subject of a complaint filed under subsection (a)(1), the Corporation may not withhold air traffic services as a means of enforcing the charge or fee. (3) Noncompliance Prior to the issuance of a final order by the Secretary determining the correctness of a charge or fee that is the subject of a complaint filed under subsection (a)(1), if an air traffic services user does not comply with the requirements of paragraph (1), the Corporation