Originally Posted by
giblet
I tried calling the Air China call center and got hung up on both times.

The Air China website is hopeless. You have to phone them to book, or alternatively send them a fax.
The lower hassle route is actually to book trough a travel agent or website.
www.zuji.com will work but will not be the cheapest - a Korean website would be better (but I'm afraid I don;t know of any).