News NEWS Delta opens Terminal 4 extension at JFK Last updated: January 20, 2016 22:56 admin4493 9 years ago 0 Min Read Delta Air Lines has opened its 11-gate, 75,000 square-foot extension of Terminal 4 at Kennedy Airport. The $175 million extension builds on Delta’s $1.2 billion redevelopment of Terminal 4, which opened in May 2013.