Code of Federal Regulations Title 41. Public Contracts and Property Management § 41.301–72.3 What method of payment must we authorize for common carrier transportation?

(a) GSA's Government contractor-issued individually billed charge card(s);

(b) Agency centrally billed or other established accounts;

(c) Cash payments (personal funds or travel advances in the form of travelers checks or authorized ATM cash withdrawals) when the cost of transportation is less than $100, under § 301–51.100 of this chapter (cash may or may not be accepted by the carrier for the purchase of city pair fares);  or

(d) GTR(s) when no other option is available or feasible.