In addition to the per diem reimbursement for travel expenses, there shall be allowed a travel allowance at the common carrier fare, or the cost of charter or other special hire, if essential, or other similar fares as necessary for the efficient performance of official duties. No reimbursement shall be allowed for more than the lowest tourist class fare for the most direct route unless:
A. Tourist class accommodations are not available;
B. Waiting for such accommodations would occasion a delay harmful to the borough;
C. The department head finds that travel by such accommodation is not in the best interest of the borough and authorizes other accommodations.
(Code 1989 § 11-3)