He didn't say all of them were in maintenance.
Apply DL's workrules to AA, and you'd wind up with overages in just about every workgroup. Staffing ratios would change, some cities would be outsourced to ground handlers, and some markets would no doubt be flown by vendors operating 90 seat jets instead of mainline MD80's and 738's.
And yes, you'd see management layoffs as well, due mainly in part to supervisory ratios, but also in admin and back-office areas like revenue management, finance, HR and payroll where staffing is directly related to the number of employees, cities served, etc.
Bob complains about the metric that WT is referring to, and I actually agree --- productivity alone isn't the metric to compare. Stage length adjusted CASM is. Whether or not the company insources or outsources is neutralized when you look at cost per seat mile, and the industry analysts have a weighting model which further neutralizes things like average stage length so that you get a better comparison.
And there's no doubt AMR's sucks in comparison to the other guys. It will be even more apparent next week as financials start rolling out.