Yes, round-trip transportation at coach rate on commercial airlines is reimbursed.

The ticket or trip itinerary showing ticket price, destinations, travel dates and times is considered the receipt. The traveler should attempt to book air transportation to ensure the lowest rate. Late requests which result in failure to secure the lowest possible fare may result in disapproval of the travel authorization request. If changes to the flight itinerary result in additional expenses, indicate the additional expense on the Travel Expense Report with an explanation of why the change was necessary.  Traveler must return on the next available flight after the conference ends.

NOTE: First class or business class seats are not reimbursed.  Only coach class seats are allowed.