I looked up on Google and found that XL Airways is Real-World airline(s). But since it's name doesn't make much sense, you can use it here.

Here's a little logo you might use if you want:



There is also GTA plane skin for XL airways (AT-400 as 737):



Download link: http://www.gtagarage.com/mods/show.php?id=4929

Geez! This Thing Came up on my Mind... n was real, Freaky, Thx for letting me know 8D n thats for the new LOGO!

Edit: Hey! I found the plane! im Downloading it Thx More