The timing and audience for this LOI (anytime Howard Lutnick is involved in anything, I tend to think it's politics, not business) make me suspect that actual conversion to orders is going to take a while, and that deliveries will go well beyond 2030, even presuming Boeing manages to get the...
...737-10 certified soon. And while the Lords of Kobol know Korean Air could use some fleet rationalization, even with some retirements this is still a huge order, and I'm not sure KAL has a growth plan that will use all of these airplanes. It'll be interesting to follow, to say the least.
Until there's a firm order, it's PR.
With the orange greasy overlay of the Trump Administration being involved. It's a nice break from the daily stories of the Spirit Airlines Death Spiral, I guess.