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Yesterday Delta revealed mileage earnings for flights on its new joint-venture partner, Korean Air. Now we have even more good news about the integration of the two carriers.

Delta announced that you will be able to use Global Upgrade Certificates on Korean. This is similar to how you can use Global Upgrades and even SkyMiles to bump yourself up on Delta’s other joint venture partner Virgin Atlantic. Global Upgrade Certificates can also be redeemed on select Air France, KLM and Aeromexico flights.

Global Upgrade certificates are available as a choice benefit for Delta Diamond Medallions, the carrier’s highest elite tier.

Using a global upgrade can be difficult, even on Delta itself. When using them on Korean, you’ll be restricted to purchasing Y, B and M fare classes which usually means you’ll have to pay a pretty penny for an upgradable ticket. Still, with the high quality of Korean’s business class, it could be worth redeeming a certificate on the carrier.

Upgrades have to be confirmed at least 24 hours prior to departure, and you unfortunately can’t put yourself on the waitlist. And upgrading to first class isn’t an option either.

H/T: One Mile At A Time

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