"It's not my threshold."
But if you picked it, doesn't that make it yours?
"So it would seem that DL's structure would make it very close to US's CASM."
Looks like they'll be the test case. Can a large network carrier increase RASM (or even maintain it) with a rational fare structure.
Actually, as far as I'm concerned, there's nothing magical about 10 cent RASM - except that U's CASM is higher than that. If AMR or CAL had AS's RASM, they'd have broken even (give or take a few million) in 2004. Heck, give almost any other carrier U's RASM and they'd be printing money. Conversely, give U almost any other carriers CASM and U would be printing money.
Actually, I think "your" 10 cent RASM dividing line is a little skewed. Few carriers break that barrier whether they have a rational fare structure or not. And the ones that do aren't any better off than many of those that don't, and worse off than some.
U's problem is not low revenue as measured by RASM (since we have high RASM by industry standards), it's high costs. Especially now, that high cost is driven by inefficiency. Fix that and you fix a lot of U's problems.
I tend to like a loose parallel to the old retirement income analogy - the one that says retirement income is a 3-legged stool. One leg is social security, another is the employer's retirement plan, and the third is personal savings. Along those lines, I think of U as sitting (teetering?) on a 1-legged stool. The one leg supporting high costs all these years is high revenue. That single leg is being eaten up by termites (the LCC's) and the stool is about to collapse.
Jim