Delta Airlines Has Brought Back Its Mainline Service To TRI Cities Airport After Being Out Of Commission For Nearly Three Years. A Boeing 717 Departed The Tri This Morning Headed To Atlanta Georgia. Its Larger Than The CRJ Aircraft That Flies Out Of The Airport On A Daily Basis. It Also Holds More Passengers. The Plane Will Be Around Through January 1st, But Airport Officials Are Hopeful It Will Be Around For Along Time.