I worked there as a DC8 FO from Apr 1991 to Feb 1993.
They furlough/recall a lot when they lose/gain cargo contracts. Not much job stability. I was furloughed 3 times in my short time there. From the Air Inc newsletter they are still doing that.
I think they now have 747s with maybe a DC-9 mail contract on the West Coast.
Good experience as all of the 747 flying is international. They got rid of the DC-8s long ago. Not the best working conditions either. No contract, lots of deadheading on their jumpseats. JFK was my base. Often I didn't know when I was coming home or when I was going to start a new cycle.
...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!