FS2004 KLM Boeing 737-800 Retro Colors flight2000it 15 years ago FS2004 KLM Boeing 737-800 Retro Colors. The Project Open Sky B737-800 in KLM retro colors. By Colin Lowe. 10 Mb FSX/FS2004 – Boeing 747-206B KLM– FS2004 KLM Boeing 737-8K2FSX/FS2004 – Boeing 747-406M KLM