Republic Airways Inc. is a regional airline subsidiary of Republic Airways Holdings that operates service as American Eagle, Delta Connection, and United Express using a fleet of Embraer 170 and Embraer 175 regional jets. It is headquartered in Indianapolis, Indiana. Its call sign "Brickyard" is derived from the nickname of the Indianapolis Motor Speedway. History In 1999, Republic Airways Holdings incorporated a new subsidiary, "Republic Airline, Inc." but the subsidiary had no activity prior to 2004 and no ability to operate aircraft prior to 2005. In 2004 the holding company activated Republic Airways in reaction to a pilots' suit against American Airlines. American had awarded the flying of 44-seat regional jets to Chautauqua Airlines, then the main operating subsidiary of Republic Airways Holdings. However, Chautauqua later started to operate 70-seat regional jets on behalf of United Airlines, and this caused American to be in violation of its pilot union scope clause, which prevented an airline from operating on behalf of American if that airline was operating jet aircraft of more than 50 seats, even if such aircraft were operating on behalf of a carrier other than American. To repair the situation, Republic Airways Holdings activated Republic Airline, and upon Part 121 certification in 2005 allowing Republic Airline to operate commercial service. Republic Airways Holdings then transferred the offending 70-seat regional jets from Chautauqua to Republic Airline. American was then no longer in violation of its pilot union scope clause. Republic Airways Holdings paid $6.6 million to the pilot union of American Airlines to settle the issue. US Airways' pilots had a scope clause prohibiting the airline from operating large regional jets such as the Embraer E170. The airline negotiated around this clause by offering flight deck jobs to laid-off US Airways pilots, in a program known as "Jets for Jobs". This agreement created a subsidiary, MidAtlantic Airways. As part of US Airways' bankruptcy restructuring, the 25 Embraer E170s delivered to MidAtlantic were bought by Republic to help US Airways come out of bankruptcy; Republic operates them along with additional newly delivered aircraft. In 2007, Frontier Airlines signed an 11-year service agreement with Republic Airways. Under the agreement, Republic would operate 17 Embraer E170 aircraft for the Frontier Airlines operation. The first aircraft was placed into service in March 2007, and the last aircraft was expected to be placed into service by December 2008. On April 23, 2008, Republic Airways Holdings