You really want my comments? And you want them Free?
Question is: How you want this web booking site to be separated from the mainstream booking systems? I mean almost all the major portals such as sina, eLong, etc. (or even Yahoo.com.cn) have their travel channels doing the ticket booking, unless the owner thinks he has special deals or connections from a few airlines. Otherwise since this is a startup system which comes late, does it still stand a chance to compete with these big, fat buys? Or the founders only want to share the same pie with the major ones for their left over that they can't handle?
All the ticket booking systems, among all the businesses, in China have problems in two folds: Cultural/Structural and the owner's vision. These are the constraints more on the business side than the technical side.
Take the bottom up, if the owner's vision is only doing the business for making a living by copying the same models from other booking systems, the GUI or web apparence really doesn't matter much. At least I would suggest to put the phone number on every page since it's the way the business is conducted. I don't think they have any system engineer to put up the least set of requirements and test the site against these requirements. One example is that if you want people to call for tickets, you don't want people to click through other pages to find the phone number. This comment is from the fact that the first page doesn't have phone number. Does the own ever think about selling his booking system or bring it to the public someday in the future?
Another comment is that it's always amazed to me that the Chinese tickewt agent delivers the ticket like the fast food delivery. I bet people know how to handle emergency situation when deliver a ticket to home address is impossible.
The first constraint is obvious. Limiting the "From" city to Shanghai instead of every city in China that has air travel capabilities reflects the fact of lacking the resources or constrained by the regulations. This is the bottom line every business is competing for.
The overall comments are that the GUI feels and looks quite neat and clean, using the drop down instead of pop up is quite smart way to comply with most of the modern day corporate IT policy. I believe the owner would have future growth in his mind not limit the booking system to only the air ticket booking, it couls extended to any booking such as hotel booking, vacation package booking, movie/sport/Convention events booking, anything constrained by the natural resources, and also provide passport service international travel.
My 2 cents.