Many US airlines pledge allegiance to Republic Airways. The airline holding company's subsidiaries Chautauqua Airlines, Republic Airlines, and Shuttle America offer passenger flight service to major airports and smaller markets, as well as regional service under code-sharing agreements with American, Continental, Delta, United, and US Airways. (Code-sharing allows airlines to sell tickets on one another's flights and extend their network.) The company maintains a fleet of about 240 aircraft and offer scheduled passenger service with more than 1,250 flights daily to 100 cities. Republic made headlines in early 2016 when it filed for Chapter 11 bankruptcy protection.