I plan to travel to HK In Jun and decided to book my air tickets online. I went to 3 websites, namely Asia Travel, Zuji and airfares.com.sg. For the purpose of comparison, I chose the same dates for the 3 websites. It came out that the prices of airline quoted by the 3 websites were different. JetStar Asia Travel quote only one price for adult and child. The price was $290 for JetStar. The total for 2 adults and 2 child totalled $1,160, the cheapest among the 3 websites. But when I try to book the ticket, i saw an additional charge of $160 for 4 tickets. The total added…