The attrition is key - without it things go stagnant and without quick upgrades or a promise of movement to mainline people aren't overly happy to jump at the bit. I feel this is part of the reason everyone was screaming last summer than the sky was falling, but sure enough the "pilot shortage" seemed to be short lived...I can't wait to see if folks can staff moving forward, but I personally feel that with the exception of the folks who pay pennies, everyone else will staff "ok" this coming year.