On September 14, 2005, Northwest Airlines filed for Chapter 11 Bankruptcy protection. Subsequently, the airline withheld over US$25 million in payments from their regional partners, Mesaba and Pinnacle. Northwest proceeded to announce plans to ground the entire Avro jet fleet by Q1 2007, ten Saab 340B aircraft by January 2006, and also halt the delivery of the 13 remaining CRJs, leaving Mesaba with an awkward and expensive fleet of two aircraft types. Facing rising fuel costs, downsizing plans, and lack of income from Northwest, Mesaba filed for Chapter 11 Bankruptcy on October 13, 2005.