I am in the school house now. Easy to ask questions. Stuck my head in the door and asked one of the new hire instructors how many have quit. His answer was three. Easy way however to check. Gaps in seniority numbers will tell the tale.
P.S. Aside from the contract issues things are pretty damn good at Delta now. I suspect some of the posters have never seen bad.

Edit My brain is fried from 767 procedures. I forgot that they resequence the numbers monthly. A quick look at Jan hires however showed 64 on the list. As of the 1 Apr list 63 remain. Attrition of exactly one pilot and I believe one pilot was fired so voluntary attrition of zero. Someone else can look up later months. The number 3 sounds good.
2nd edit: I forgot that the total new hire numbers numbers are posted in the pool thread. From 1 Jan to 24 Mar we hired 277 pilots. The 1 Apr seniority list shows 274 remained at that point. Total attrition 3 pilots 1 of whom was fired. The other two unknown.
Those new hire coordinators know some **** don't they!