Speaking only for the pilots, there are very little productivity enhancements left - unless you count vacation and sick time.
According to the Daves, our pilot productivity (average block hours flown per month) is 20 hours less than at Southwest. In 2001, it was only 12 hours less (per the UAL BK filing chart on pilot productivity for major airlines). Our productivity has gotten WORSE in spite of work rule concessions. For pilots (and I think somewhat for the f/a's also) the lack of "productivity" is due to primarily two things - downsizing and the hub/spoke multiple fleet type structure.
Jim