4 (Base Aérea Nº 4, BA4') TER, is a multi-use airfield, home to the Portuguese Air Force Base Aérea N º4'' and Azores Air Zone Command ( ), a United States Air Force detachment unit (operated by the 65th Air Base Group of United States Air Forces in Europe - Air Forces Africa), and a regional air passenger terminal located near Lajes and 15 kilometers northeast of Angra do Heroísmo on Terceira Island in the Azores, Portugal.