If the discovery of aeroplane and consequently air travel were a boon to human civilization, it has also fuelled a lot of debates concerning its advantages and disadvantages over the other popular mode of transport-train or railway. Many people give traveling by aeroplane a big thumbs up because it cuts down on the time it takes to travel from one place to another. For e.g. if you take a flight out of your city, you can reach a different city from your local residence, say, within a space of 3 hours. It would take a train more than 24 hours to cover the same distance. Busy executives, corporate honchos, businessmen, celebrities, political big wigs and others who are always facing a time crunch prefer to travel by airway for it is the fastest mode of transport on earth and flying in  the executive and business classes is one of the most luxurious and comfortable experiences one can hope for. But on the flip side, air travel is costly – not everyone can afford it and spending long hours on a lengthy air journey can become pretty boring at times, with nothing to see out of the windows. Moreover, there’s the green issue or pollution ...