Hi there!

I got it. In fact, it makes sense. It would be unfair to the pilots being bypassed by a new one just because he was already with the company.
Yes, at Delta you bid with seniority got in your class and have original hire date seniority for Nonrev list. I do not know why flight attendants get some "seniority credit". As for pilots, seniority really starts when you pass the checkride.
Thank you so much for your quick response!
Fly safe.