Hi! I do have some TK miles to spend and would like to book an award ticket in business class but unfortunately there is no I-booking class available on the date I would love to book. Now I thought about booking a paid economy ticket and use the same amount of miles to upgrade to business class - the economy ticket would only be a little more expensive than the taxes and fees I would need to pay for the award ticket. The economy ticket would be issued in booking class L. I also checked the business fares and the J-booking class would be available.

Would it be possible to upgrade from an economy ticket in booking class L using miles?