CHICAGO (Standard&Poor's) April 27, 2009--Standard&Poor's Ratings Services today revised its rating outlook on Norwalk, Conn.-based online travel agency Priceline.com Inc. to positive from stable. Ratings on the company, including the 'BB-' corporate credit rating, were affirmed. "The outlook revision is based on Priceline.com's good operating performance in a difficult leisure travel market," noted Standard&Poor's credit analyst Andy Liu. "The company appears to be gaining market share from its much larger competitors. Furthermore, Priceline.com's credit measures have been steadily improving from a combination of debt reduction and EBITDA growth." The rating on Priceline.com reflects the highly competitive online travel agency market, some supplier concentration among airlines and hotels, and lower incentive fees from travel service