Okla. Stat. tit. 74, § 74-500.11: Reimbursement for out of state transportation costs

A. Authorized persons traveling on official state business

outside of the State of Oklahoma may utilize appropriate forms of

transportation, including but not limited to, common carriers,

transit system carriers, state owned or privately owned motor

vehicles or airplanes, contract rental motor vehicles, commuter

airplanes, or transportation by private parties to reach their

destinations.

B. 1. Except as otherwise provided by this section,

reimbursement for out of state transportation costs as authorized by

this section shall not exceed the normal charge for the type of

transportation used, but in no instance shall reimbursement for

transportation used in lieu of commercial airplane exceed the cost

of coach or economy class air fare.

2. Reimbursement for travel by commercial airplane on a first-

class basis may be made if coach or economy class space is not

available within a reasonable time and is justified by attachment to

claim for reimbursement.

3. Claims for reimbursement for transportation by commercial

airline shall be accompanied by the passenger's airline receipt

which includes information as to class of accommodation for which

reimbursement is claimed.

4. If commuter airlines are the only airlines available to

reach a destination, reimbursement for transportation used in lieu

of commuter air fare shall not exceed the cost of the commuter air

fare.

C. Reimbursement for authorized use of privately owned motor

vehicles or vehicles from motor vehicle rental agencies used for

out-of-state travel shall be limited to the actual cost for such

vehicle but in no instance shall reimbursement for such vehicle

exceed the cost for commercial coach or economy class air fare or

commuter air fare, whichever is appropriate. Distances for which

reimbursement for use of privately owned motor vehicles or vehicles

from vehicle rental agencies is claimed shall not exceed distances

as computed by a Global Positioning System (GPS) or based on map and

vicinity business mileage set forth in a recognized published

national atlas or road map. Vicinity travel on official business

shall be entered on travel claims as a separate item.