Labor costs are only part of the equation. Yes under Parker's plan labor costs would be higher, but other fixed costs would come down. For example, US Airways has said a merger would reduce non union cost cuts by $500 million per year.
If US Airways' plan would generate $1.5 billion in additional revenue and cost cuts then what's Horton's objection to the proposed merger? Furthermore, why does Horton want greater cuts for AMR's employees than offered by US Airways to support a stand-alone plan?
I think you mean to say "costs", not "cost cuts"
In other words, under Parkers plan, management takes it in the shorts much more so than in Horton's plan.
That is why all 3 unions at AA are all in with Parker.