Nowadays cheap air travel is increasingly popular in the world. To what extent do you think its advantages outweigh its disadvantages?
There was a time when air travel was only for the wealthy people and out of reach of the majority of citizens. But now low-cost flights are available in many countries. I believe this is, overall,（overall插入语，总体来说，使句子表达留有余地，更加地道。） a positive development. （第一段简洁明了，用自己的语言描述题目背景，there was a time when曾经用词地道，没有模板痕迹，显示出考试的语法水平。)
The most obvious advantage of low-cost flights is their affordability. （主题句提取很好，简洁明了。）Nowadays some airline tickets are so cheap that they cost even less than the airport tax. This change can certainly give more people affordable access to air travel and help them to save money.
Low-cost air travel also（also与上一段自然过渡） contributes to the growth of tourism because it provides more tourists with the chance to travel by air. Time is valuable for them and most of them hope to spend more time in their destinations. Compared with a journey by train or by coach（长途汽车）, low-cost flights save tourists a great deal of time. This means that they can have more time and energy to enjoy the attractions that they wish to visit.
Some people are worried that low-budget air travel may be less comfortable than regular flights. In fact, most low-cost flights provide the same seats as the seats offered to economy-class passengers on regular flights. Even if we feel unhappy with the seats, we can always get a better seat at a bit of extra cost. （反驳对方观点，证明自己观点）
Some other people may complain that cheap air travel consumes more fuel and causes more pollution. However, cheap air travel is not more damaging to the environment than car rides and coach tours because passenger planes can carry far more people than cars and coaches do.（逻辑性强，推理论证）
In conclusion, not only can （运用倒装句型，语法多样性）cheap air travel offer us affordable flights, it can also give us greater convenience and more options, on which we cannot put a price tag（put a price tag on something 正确运用定语从句）.