For the most part, legacy carriers have more pension costs, more cost of living or other pay raises for years of service, more unionized employee groups, less farming out of work, higher pay scales, less productivity, more work rules, than do the LCC's. All of these things cost money.
I hate to call DHL, UPS, FEDEX or others airlines because it implies that they are in the same industry as passenger airlines which they clearly are not. Even within that industry, the overnight people are different than the freigh haulers.
From my generations perspective, unions were born of the need to protect workers from substandard working conditons and indentured slavery. There is a big stretch between that and representation of a group of educated professionals who think $100k is nothing to fly the latest and greatest Boeing hunk of metal.
I am not here to say unions are bad, not at all. The problem is that in a world based economy the only way the union can really protect its members is ---- well they can't, at least not in market driven business. Only government employee unions have the isolation necessary to keep power today.
Do you think for a moment that unions would have the place they do in our industry today had they not started back during regulation. From the union perpsective, they were attracted to this industry due to the high wages. Better to get 1% of $300k than some job that is barely above minimum wage.
The fact is that they got their foothold in a protected environment adn the rest is history. When ALPA represented the majority you could keep control. All of that has gone out the window.
Unions may not be bad but they are no better than the management everyone here isso critical of. Success like Southwest takes good management and good employee groups, and good union leadership. Very few have all three in combination.