If you really enjoy the A318CJ, check out this defunct Austrian operator that based at Vienna and flew multiple examples. The entirety of Europe is well within range of the A318CJ. Textures for the pictured OE-ICE are found within the RMAG A318CJ download, which is a complete freeware aircraft with VC with weight and balance numbers for the 40-seat British Airways transatlantic version that links London City with New York. Aerosoft payware fans, your P3D4 textures are here.
As a bonus, you'll find that JetAlliance's OE-HAK is a stock livery in Alrot's noteworthy freeware Cessna Citation X, and there's even an Eaglesoft payware paint available (along with many other FS9 aircraft paints at Avsim).
As for where to fly these airplanes, JetAlliance had built an incredible European network of elite business and leisure destinations. Use your imagination. One possibility is to expand into the Persian Gulf with the addition of an A318 paint from AbuDhabi (OMAD)-based Al Jaber (multiple options at Avsim). Like JetAlliance, Al Jaber Aviation is also a "fallen flag," allowing the virtual pilot to make it their own. If you still need a map, here's one with a few ideas.
