Originally Posted by
anabolism
Codeshares and which airline tickets are separate, although both may affect carrier surcharges (YQ/YR). I've been able to book any codeshare for international flights, but not for domestic flights (which makes sense because of regulatory constraints).
Yup - they are separate, but both affect pricing. eg those collection BA/Avios can find loads of BA codeshares but the YQ seem to grow significantly