This plane paper model is a S7 Airlines (PJSC Siberia Airlines) Boeing 737-800, repainted by Allfor based on Julius Perdana's Boeing 737-800 template. The scale is in 1:100. There is another version on the site.
There are also a Ryanair version, China Eastern Peacock Version, a Corendon Airlines Boeing 737-800D Airplane Paper Model and a GOL Airline Boeing 737-800 Paper Model available.
You can download this papercraft template here: S7 Airlines Boeing 737-800 Ver.2 Free Airplane Paper Model Download [Box] [Gavitex]