41 CFR 301-72.100: -72.100 Requirements for travel accounting system related to common carrier transportation.

The travel accounting system must:

(a) Authorize the methods of payment outlined in the agency's internal policy in accordance with part 301-51 of this chapter;

(b) Correlate travel data accumulated by the agency's authorization and claims accounting systems with common carrier transportation documents and data for audit purposes;

(c) Identify unused tickets for refund;

(d) Collect unused, partially used, or downgraded/exchanged tickets, from travelers upon completion of travel;

(e) Track denied boarding compensation from employees;

(f) Identify and collect refunds due from carriers for overpayments, or unused, partially used, or downgraded/exchanged tickets; and

(g) Reconcile all centrally billed travel expenses (e.g., airline, lodging, car rentals, etc.) with travel authorizations and claims to assure that only authorized charges are paid.