I have had two NW captains tell me that they would not take me if I were a JetBlue pilot. The latest said it was because they are flying airbusses for such low wages.
I am furloughed US Airways now working for PSA. I told him I thought it was amusing because JetBlue pilots make more than US Airways pilots. (For the same equipment). His reply was "well US Airways won't be around very long anyway.)
In either case, his reasoning for denying JetBlue and not US Airways is faulty.
Having said that, I have used NW numerous times and have never had a problem.