Hi - I have a few more questions about booking domestic flights in China that I was hoping someone could answer.

1) Which of ctrip, elong, and yoee (and any other sites that ppl can suggest) allow booking intrachina flights using credit cards from the US? From past threads, I'm pretty sure yoee does, but am not sure if the other 2 do and if any of them have an additional surcharge for using international credit cards

2) Out of the above sites that allow international credit cards, does anyone recommend one over the other or does it not really matter? I've found that they all have similar fares

3) It appears that most of the tickets I'm looking to purchase have a 5% of the fare cancellation fee. I'm planning to purchase discounted tickets and if the fare goes down even more, cancel the ticket and repurchase it - does anyone see anything wrong with this? Is it easy to cancel?

4) Has anyone seen discounted Xian->Guiyang tickets? I haven't found any discounts for any date so I plan on just purchasing them now