Hey Dan (and others)....
FWIW, Im a DAL pilot (after 8 yrs at ASA)... If you get hired (eventually) with Delta and have ANY previous Delta experience (including throwing bags for a summer), you automatically get moved to the most senior position in your new hire class. Also, it will get your preferential hiring with DAL as a "previous delta employee."
If DAL is in your career ambition, then might be worth it. Just thought Id mention it.