Variant Release : Boeing 757-200SF - Freighter by Flightfactor/VMAX   Flightfactor/VMAX has released another variant for their excellent Boeing 757-200 series aircraft. In March 2014 Flightfactor/VMAX released the Pratt & Whitney PW2037 variant besides the original Rolls Royce Engines - RB211-535E4 and in this release is the "Cargo" variant for both engine choices. To install this cargo extension version you must already have purchased the Boeing 757 Professional series.     Insta