Originally Posted by
SuiteFlyer
Be careful that UA does not book in U class for Air China flight - I arrived in Beijing yesterday and had a separate internal China flight booked in U - Air China did not recognize it - I had to go to UA desk (thank goodness it was still open) and they had to work with Air China to rebook in K class. The UA agent said this was a common problem
Aye. Different carriers use different booking codes for the same fare. A great example is AC using A for deeply discounted Y. Each fare has a table associated with it for what booking code to use on each airline that the fare can apply to, called the "legal booking class" ($LB).