a. General. Travel costs
are the expenses for transportation, lodging, subsistence, and related
items incurred by employees who are in travel status on official business
of the institution. Such costs may be charged on an actual basis, on
a per diem or mileage basis in lieu of actual costs incurred, or on
a combination of the two, provided the method used is applied to an
entire trip and not to selected days of the trip, results in reasonable
charges, and is in accordance with the institution’s travel policy
and practices consistently applied to all institutional travel activities.
b. Lodging and subsistence.
Costs incurred by employees and officers for travel, including costs
of lodging, other subsistence, and incidental expenses, shall be considered
reasonable and allowable only to the extent such costs do not exceed
charges normally allowed by the institution in its regular operations
as a result of an institutional policy and the amounts claimed under
sponsored agreements represent reasonable and allocable costs.
c. Commercial air travel.
Airfare costs in excess of the lowest available commercial discount
airfare…. (Link)