the data regarding unions success just happens to be generic and not specific to the airline industry.
It is well accepted in analysis that if you can use more specific data in an analysis, you DON'T use something less specific.
ie you wouldn't use the general cost of living to compare fuel prices when there is specific data available for fuel prices.
What is clear is that DL employees have received far more and larger raises and increases in compensation via profit sharing than at other airlines - and that is just since the merger.
And once again, as much as some want to ignore or downplay it, fewer DL employees lost their jobs in the period between 2001 and 2009 with the merger than occurred at NW. DL ADDED employees between BK and the merger while NW cut further.
further, DL FAs were higher compensated on average before and after BK than NW FAs.
there is a reason why more than half of the combined DL/NW workforce in every major group chose not to be unionized.
given that DL was only about 20% larger than NW, it would have taken only about 15% of PMDL employees plus all PMNW employees for the combined groups to become IAM. There had to be plenty of NW employees who voted against the IAM and unionization.
In reality, it is clear that the same reason why the NW mechanics ditched the IAM is the same reason why 5 out of 5 (did I get that right, Kev?) chose not to be IAM represented: the IAM simply did not deliver anything of value compared to other unions and esp. compared to DL.