True, however there is almost no fleet commonality between NWA and DL(I think the 75s are about all, and even those may use different engines), they both have fortress hubs in the eastern portion of the country. I don't think loads are going to remain as high as ticket prices go up. I think we'll start seeing a decline as a result.
However, they both rely heavily on regional carriers for domestic flights, and each carrier has a focus on a different part of the world for international flying. In those respects it could work.