Tzell Travel Group, LLC, a division of Travel Leaders Group, is one of the largest corporate travel management companies in the United States. Based in Hewlett, N.Y., it is one of the largest corporate and leisure travel companies in the world. The firm offers a broad product line of cost containment, meeting services and comprehensive travel management programs. Tzell Travel Group, LLC specializes in the entertainment and sports and has worked with various firms in music, television, cinema, theater and sports.