So can you park mainline jets even with DCI 450/325 and stay above the ratio? Yes.
1.56 helps some, but not a lot.
What about ASMs? That's the x factor but my bet more likely to decrease at 1% then grow any. We decreased 1% from 2010 to 2011 according to the 10-k.
If they discard ASMs they didn't want anyways and a 2% reduction is acceptable, then 88 717s and 32 CRJ-900s can take out most of the 88 fleet. In fact, 229 CRJ-900s take out the entire MD88 fleet vs 350 CRJ-200s.
They could aways ask for relief on the 1.56 or ask to swap 102 seaters for 68 76 seaters and nail the 88's coffin.
I'm sure we wouldn't allow them to change the 233, 325 or 450 caps now would we? Where would be the precedence in that?