F-35 Flight Test Update 11 27 Aug 2013 By Eric Hehs
"...14 June 2013: AF-6, AF-7, BF-17, and BF-18 were used to complete the first F-35 airborne four-ship MADL connection; at Edwards AFB, California. The airborne four-ship also achieved MADL connectivity with AF-3 during its ground test, marking the first five-ship MADL connection...."
Code One Magazine: F-35 Flight Test Update 11