1: Furlough pay. Not much for junior pilots (I think a couple weeks pay but not sure).
2: Seniority and longevity while on furlough, and seniority while on bypass.
3: Generous bypass rights (10 years or possibly more in some future cases) with no "spit or get off the pot" system like some airlines have.
4: DALPA will *probably* continue the tradition of providing medical for furloughed pilots.
5: Limited pass/travel benefits.
6: They probably won't take your wings. Srsly, some carriers actually do that.
7: Flowback agreements (top down) with CPZ and I think Mesaba (not sure about that though), effectively giving every DL new hire a 400-500 pilot "cushion" and since every furloughed pilot likely wouldn't partake of that opportunity, a potential flowback job could possibly go close to the 1000 pilot point.
8: Pref interviews by other DCI carriers (bottom of the list first year regional FO pay jobs, but at least its an option).
9: Free double breasted "Get Off My Lawn!" jacket so you can yell at those pesky kids and their rock and roll music in style.
10: Various miscellanious penalties to the company, most of which are too tedious to explain, but as an example the company has to pull 6 seats out of their beloved 76 seaters, a provision of which is not subjected to force majeur clauses, etc. plus other things like that.
11: Very low risk of furlough unless something truly massive happens. In the 4 years since the merger, there's been a never-ending recession which by many measures is one of the worse in history, a $145/bbl oil crisis, permanent $100/bbl range oil, perpetual wars, SARS, Swine Flus, Volcanoes, Tsumanis and several periods of nominal yet significant overstaffing where the surplusses were carried without any serious threat of a furlough, etc. And all that was when the only retirements were from a few targeted programs. This and next year don't have massive mandatory retirements, but beyond that is shaping up to be pretty significant. If they are going to furlough this decade, they'd better do it now. Like right now. But they can't, because we're understaffed and we're hiring.

Might not want to go eyeballs deep in debt for that "Captain's House" or second boat, and maybe junior isn't getting 6 figures to party hardy and regurgitate a reading list for art history material that's available for free at any library or on the internet, but this is as good a time as any to get on.