フロンティア航空
In 2007, Frontier Airlines signed an 11-year service agreement with Republic Airline. Under the agreement, Republic would operate 17 Embraer 170 aircraft for the Frontier Airlines operations. 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 (parent of Republic Airline) terminated its service agreement with Frontier Airlines, which entered Chapter 11 bankruptcy in early April 2008. Subsequently, Republic Air Holdings purchased Frontier Airlines in bankruptcy. Frontier branded Republic Airline E-190 aircraft provided regional capacity support. In September 2013, Republic Airways Holdings sold Frontier Airlines. As part of the sale, Republic Airline terminated the Frontier branded E-190 flying.