This is what I have from your intro:
A cheap air travel is becoming more popular than ever before. For some people, the cheap price experiences short-term safeties. For some others, this raises an opportunity to travel an to get more experience. Both these views have their own merits and demerits. However, I believe on a cheap air travel would have the best quality in contrast to having the worse quality.
Body 1:
To support the main idea, you should give one example. This can be taken from your personal experience.
Body 2:
According to my own experiences
This is used when saying what people, organizations, and reports, not your words.
When giving your opinion about something, use this: I think that/ in my opinion...