I think we're all going be waiting to see what happens with this egg. I'm betting it hatches . I think that little chick is saying I can do this just a little bit more time and I'm outa here. At this late day into incubation I don't think the air sack will move . one thing I've learned this past 2 years is it was so much easier when the hen did it. 4 more days! you'll know. hatching is like taking a long car trip. at first your excited to get going then it gets dull then your almost there and its exciting again .then the hatch and your swimming in the ocean or skiing the slopes or hiking the trails. Its so much fun I'm sitting on pins and needles waiting for tomorrow morning. I only set eggs on Saturday now so I'm not working when they hatch . We'll be waiting .good luck