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Korean Air Upgrades
How easy is it to upgrade from KAL Business to KAL First using miles? How could I go about doing this?
Did you purchase a ticket in business class or is it an award ticket? I believe it can be done online thru SkyPass
It was a award ticket purchased with Delta miles
In your case, KE Business is the best you can get. Delta does not allow international first class awards at all. And you cannot use miles from a different program to upgrade an award ticket issued by another carrier.
Normally, you upgrade awards using the same program you booked the award with, regardless of the airline you are flying.