Yes, the WDR difference is about 250K vs 100K which further supports the original point about efficiency, but both are actually light twins compared to the fleet of our code share partners.

The original point still stands though, the A330, especially the -302 is a more profitable option for the US-Europe and West Coast to Asia markets. The passenger and freight capabilities are very similar. The 12+ hour legs or the need for lift of extra bulk cargo are where the extra range and payload of the 777 becomes an advantage. Don't get me wrong, I love the 777, but you are flying way more airplane than necessary if you have 290 passengers and a 30 containers of freight on a 10 hour flight.

Boeing 777-200ER (777) : Delta Air Lines
Airbus A330-300 (333) : Delta Air Lines

https://www.deltacargo.com/ShippingT...ing777200.aspx
https://www.deltacargo.com/ShippingT...bus330300.aspx