FS2004/FSX – Longer Contrails flight2000it 12 years ago FS2004/FSX – Longer Contrails. Makes your contrails in FSX/FS2004 longer and more realistic. Thanks to Jan Rosenberg for teaching us how contrails work in FS! By Jeff Favignano. 260 KB – FS2004 High Altitudes AI Contrails Tool– FS2004 High Altitudes AI Contrails Tool– FS2004 High-Altitude Contrail