Miles wise China Eastern is twice as lucrative for Delta flyers than China Southern. Although you can now earn American Airlines miles but not EQDs with China Southern.
JFK-FOC with China Southern would earn 16876 RDMs 16876 MQMs 3375 MQDs 1.88 MQD Ratio
JFK-FOC with China Eastern would earn 31096 RDMs 23322 MQMs 6219 MQDs 3.19 MQD Ratio
China Eastern operates Boeing 777-300 with a beautiful cabin configuration of 1-2-1 seats.
China Southern Boeing 777 Business Class
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