Originally Posted by dvs7310

I've used them a fair amount over the past couple of years and I've only ever been able to do it during booking on their own website or by calling. Never found a way to change online after that point. I always call the Beijing call center as the one in Japan rarely will let you queue for an operator, just tells you it's busy and try later. Never a big problem, the English is sufficient for such a simple task.

Originally Posted by yqtyyz

I also called Air China's reservations line to select my seat for an award booking. Had my seat map in front of me, requested the spot, and it was done quite easily.

This was the number I used: Tel: +1-800-882-8122 (Americas, according to the website).