This aircraft is well known in Germany's Media. Seems to be a charter aircraft for the US Army, although the Rhein/Main Air Base is definately closed now.
Short final for rwy 25L. [EOS300D + EF 75-300]
strange 737 taxied to the USAF ramp after landing and left GRA 2 hours later. Maybe CIA ? Who knows.
note the arriving Airbus from Lufthansa in the background