I just changed my flight from China eastern to China airlines. I was booked in business class and in my confirmation display it said Sky Priority. Now, that I have switched to China airlines, it doesn't say anything. I forgot to confirm that it is business class and I can't select a seat. The only thing on my ticket that would be able to tell me if its biz or economy is the booking class fare, which is O. I can't find any information online about this code. It was booked through delta awards. Any help?

Thank you