I think that the one egg I have left(of 4) has a detached air cell. It seems to be developing fine and the air cell is about the right size. It's under a broody hen. But the last 2 times I've candled(I had been candling every other day or so, but I'm trying to back off) the air cell rotates around when I turn it. But I've heard that the air cell should move all around the egg if it's detached and this one stays on the right end and just moves around on what seems like one point.