; and (B) would not have otherwise been captured directly from the ambient air and disposed of in secure geological storage but for the offset credit described in subsection (b)(2)(B)(iii). (d) Reconciliation of payments due (1) Definition of actual surcharge amount In this subsection, the term actual surcharge amount , with respect to a flight for which a surcharge under subsection (a) was assessed for 1 or more qualifying tickets, means the product obtained by multiplying— (A) the actual quantity of qualifying tickets sold for the flight; and (B) the amount of the surcharge for a qualifying ticket for that flight, as determined in accordance with this section using— (i) the estimated flight time for the flight; (ii) the actual model of the aircraft used for the flight; and (iii) the calculated lifecycle greenhouse gas emissions of the fuel or mix of fuels consumed during the flight. (2) Determination After the termination of a flight for which a surcharge under subsection (a) was assessed on 1 or more qualifying tickets, the operator of the flight shall determine the actual surcharge amount for the flight. (3) Reporting and remittance If the actual surcharge amount for a flight differs from the total of the surcharges assessed for all qualifying tickets for that flight, the operator of the flight shall— (A) not later than 7 days after the termination of the flight, submit to the Administrator a report containing an itemized statement describing the discrepancy; and (B) if the actual surcharge amount for the flight is greater than the total of the surcharges assessed for all qualifying tickets for that flight, remit to the Administrator, not later than 30 days after the date on which the operator submits to the Administrator the report required under subparagraph (A), an amount equal to the difference between— (i) the actual surcharge amount for the flight