Per University of Colorado APS 4024, authorization for travel is required in advance of the trip. Travel authorization can be requested after-the-fact. Whether or not the travel is approved is at the discretion of the approver. Reimbursement for travel expenses will depend on allowability per applicable policies and whether the sponsor will allow the costs according to award terms and conditions and if travel occurred during the period of performance. CCO is the ultimate authority on allowability of costs.