Like they said...
...plan on being furloghed anytime they feel a bump in the economic road. Great opportunity for experience, but not a place to plan on spending a career. DC-9's do domestic stuff for the post office and last I heard some for DHL or something. The 747 are probably doing mostly military charters from what I have seen, so you will get to know the middle east quite well. They do have a contract now from an in-house union. 16 day schedules, either split up or you can do the 16 day marathon all at once and get 14-15 days off straight. It is all bid by seniority. Pay starts OK but it is a long climb after that to get much more pay, upgrade is probably 8-10 years, but on the 747 you start at f.o. because of the Pro FE's they have. DC-9 base is SEA and 747 is JFK, so commuting can be an extra day or two. Good Luck!