Title 45, Chapter 7, Section 30
Except as provided in this Code section, no state official or
employee, when traveling by commercial air carrier on a first-class
basis, shall be reimbursed for that portion of the first-class air
fare which exceeds the amount of the fare of the next lowest fare
for the flight on which such official or employee is traveling.
This shall not prohibit the reimbursement for the entire cost of
first-class air fare under any of the following conditions:
(1) Space is not otherwise available;
(2) A licensed medical practitioner certifies that because of a
person's mental or physical condition specific air travel
arrangements are required; or
(3) The commissioner of public safety certifies that specific air
travel arrangements are necessary for security reasons.