New York: New American Library. Jiang, H. (2013). Service quality of low cost long haul airlines: the case of Jetstar Airways and AirAsia X. Journal of Air Transport Management, 26, 20-24.
There are hundreds (if not thousands) of free data sets available, ready to be used and analyzed by anyone willing to look for them. Below is a list of 35 of the most globally interesting I've come across, but there are many, many more in many different niches.