If you live in district 7 at SGN you have a crazy ride for one hour to the airport, whether it is by your own bike or by a taxi for about 250 k. Airbus drivers go almost every day, let's say 5 times a week as t here are some overnights in japan - if not enlarged crew is operating, 250 to the airport and 250 back times 5 are about 2.5 million or 125 USD, so in a month you fork out about 500 USD for transport to work. In Hanoi the crazy ride as you described it is 30 min and for free, so where is the problem?