Delta Connection - Pinnacle Airlines Endeavor Air is an American regional airline that operates as Delta Connection for Delta Air Lines. The airline was founded as Express Airlines I in 1985 and changed names to Pinnacle Airlines in 2002. In 2012, Pinnacle's parent company filed for chapter 11 reorganization, then emerged as a wholly owned subsidiary of Delta Air Lines. The name of the airline was changed to Endeavor Air on August 1, 2013.
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