5. Conclusions
In the era of less business profit and environmental protection issues being important, airlines must protect our nature earth and try to increase the business revenue. If airlines can grasp the global trend, detect passengers' views about this issue ahead of time, and establish a farsighted environment-friendly marketing strategy to trigger their support, they will have good business performance and will also improve the sustainability of our earth. It is as Forsyth (2011) mentioned, “For air transport, environmental and financial sustainability can be achieved together, as long as efficient policies are adopted”.