Per our travel policy: Fly the cheapest available flight that meets your business needs.
Enforced by: Flights that cost over $200 over the cheapest (domestic) or $1000 over the cheapest (transatlantic/transpacific) that have the same number of connections and arrive/depart within 2 hours of the selected fare will be flagged for supervisor approval. On international flights there is usually enough leverage built into that flagging system to get the flight you want.