I was wondering how one becomes an Instructor at AA/UA/DL ? Also, I was wondering if instructors are put on the pilot seniority list. At my regional airline, instructors are on the pilot seniority list on day one. However at JetBlue, the departments are separate and you are not put on the seniority list, also you are not in CASS so commuting is not possible.

If you work at AA/UA/DL, could you share your insights on being an instructor and if you can ever fly the line?