41 CFR § 301-10.264 - What amount must the Government be reimbursed for travel on Government aircraft?
(a) No reimbursement is required for official travel on a Government aircraft.
(b) For personal travel on Government aircraft, reimbursement depends upon which of the following special cases applies:
(1) For any required use travel, you must reimburse the Government for the excess of the full coach fare for all flights taken over the full coach fare for the flights that you would have taken had you not engaged in personal activities during the trip, i.e., for a wholly personal trip, you must pay the full coach fare for the entire trip;
(2) For travel authorized under 10 U.S.C. 2648 and regulations implementing that statute, or when you or your dependents are stationed by the Government in a remote location with no access to regularly scheduled commercial airline service and are authorized to use Government aircraft, you do not have to reimburse the Government.
(c) For political travel on a Government aircraft (i.e., for any trip or part of a trip during which you engage in political activities), the Government must be reimbursed the excess of the full coach fare for all flights taken on the trip over the full coach fare for the flights that you would have taken had you not engaged in political activities, except if other law or regulation specifies a different amount (see, e.g., 11 CFR 106.3, “Allocation of Expenses between Campaign and Non-campaign Related Travel”), in which case the amount reimbursed is the amount required by such law or regulation.
Except for required use travel, any use of Government aircraft for personal or political activities shall not cause an increase in the actual costs to the Government of operating the aircraft.