When comparing labor expense you must look at pay, benefits, work rules, and retirement.
The major difference between US Airways and the LCC's competitors is the employee to aircraft ratio.
According to a recent story in the Washington Post "Another key number listed was 84.6 -- the number of employees per aircraft at Southwest Airlines, seen as an industry yardstick of employee productivity. The Post compared that number with United's current 116 employees per plane, achieved during its bankruptcy organization. It had been 173 in 2002." For US Airways, the current ratio is 102 employees per mainline aircraft.
This is the reason US Airways senior management has said the company must change its work rules. In concept, by expanding block hours and flying utilizing the same number of employees and aircraft to average down unit costs makes sense and would help cure this problem.
Respectfully,
USA320Pilot