To improve on their market penetration, larger airline holding companies rely on operators of smaller aircraft to provide service or added frequency service to some airports. Such airlines, often operating in code-share arrangements with mainline airlines, often completely repaint [http://www.eturbonews.com/7932/commuter-airlines-bring-anxiety-business-travelers] their aircraft fleet in the mainline airline's sub-brand livery. For example, United Express regional airline partner CommutAir branded its entire fleet as United Express. On the other hand, regional airline Gulfstream International Airlines does not brand their aircraft. When Colgan Air was still operating, they branded a handful of aircraft as Colgan Air, but most were branded as Continental Connection, US Airways Express or United Express, with whom it had contractual agreements.