Since 2001 Topaz International has conducted comparative studies of corporate travel airfares between actual corporate travel agency booked itineraries and various public internet sites, including Orbitz, Expedia, Travelocity and airline direct websites. During the most recent results from 2006, Topaz found that business travel itineraries booked by a designated corporate travel agency averaged $75 less than the same itinerary booked on a public internet site, one of the largest margins since 2002.
Topaz International Portland, OR April 5, 2007