There is no doubt that the seniority of the US workforce is wreaking havoc on the company's effort to control labor costs. Whereas CO, HP, and UA experienced declines in workforce seniority through bankruptcy, US' labor pool became MORE senior overall post-Chapter 11, meaning that a larger percentage of US employees will automatically top out under any reasonable compensation plan. So when pitted against a rival carrier that maintains a large proportion of its employees at the bottom of the payscales, top-heavy US is at a major disadvantage.