The old definition of Scab is worthless these days since ALPA allowed an atrocity like the RLA to come to fruition.
The notion lives on though: a scab is someone who does not stay united with his unions cause for personal gain. PSA proved they are scabs, or at least have scab mentality. They will pay. Not just in jumpseats, but in career progression. The people they screwed will get ahead of them. Speak to any APA member these days and the buzz on them is strong. There is nothing the APA hates more than a scab. So get mad on here and spit back at the pilots standing up for the industry: it just proves how selfish and childish you are - All traits the mainlines will look to avoid.