As long as the credit card is marked with Visa and MasterCard, you can book air tickets.
If you don't have a credit card but an ordinary UnionPay card, you can order air tickets through a third-party platform:
1, Ctrip acts as a domestic agent for booking international air tickets.
2. official website of Air China, China Southern Airlines, China Eastern Airlines and Spring Airlines can also use domestic UnionPay cards to pay for international flights abroad.