The airline was founded in 2004 by Dave Spurlock, a former director of strategy at British Airways.

This change was unveiled by Adam Komack, Chief Lifestyle Officer.

[6] In April 2007 the airline announced that routes from Stansted to Washington, D.C., Boston, Los Angeles, and two other destinations were set to begin within the next couple of years.

[8] On October 18, 2007, Eos announced that it would begin flights from JFK to Paris, France, and from Newark International Airport to Stansted in 2008.

The launch of eosCLASS magazine revealed that, had Eos remained in operation, it would have expanded its fleet to 8 planes, with two added at the end of 2007, and two to follow in 2008.