No idea, notable height, probably test flight indeed, or training flight. Is from FBS BMVg (Flugbereitschaft des Bundesministeriums der Verteidigung) EDDT 14+01 Bombardier BD-700-1A11 Global 5000 GL5T c/n 9395 selcal HJEM 3F58AE - German Air Force built 2010 Remarks: "Bundesrepublik Deutschland" titles Pictures at http://www.airport-data.com/aircraft/14+01.html