Attrition, I assume. Unless oil prices really go through the roof (a possibility given recent events in the middle east) it is expected that Delta will run a few classes towards the end of the year, with 20 Compass ppl taken per month. In addition, we've been losing a few people every month to other airlines & jobs outside the airlines.

There are some rumors going around of new aircraft, in particular 6-10 EMB170s currently owned by Virgin Blue in Australia. I very much doubt they're coming here.