These are pictures of my one lonely shipped egg's saddle air cell, which is growing towards the fat end.
The first two pics is the saddle air cell between the black lines when I saw it for the first time.


This last pic is the most recent, since the duckling has grown you can't see the whole air cell as well. I got really worried at first because I only saw a little bit of it but as soon as I candled in the pitch black I could see the whole cell on top of the redness of the developing duckling. The air cell is very stationary and has actually grown since three days ago. it's growing towards the fat end so it starts just about where a normal new air cell would be at the fat end and goes to almost the halfway point of the egg. But I'm following Sally's advice and I will leave it upright in the carton for hatching.
This last pic is the most recent, since the duckling has grown you can't see the whole air cell as well. I got really worried at first because I only saw a little bit of it but as soon as I candled in the pitch black I could see the whole cell on top of the redness of the developing duckling. The air cell is very stationary and has actually grown since three days ago. it's growing towards the fat end so it starts just about where a normal new air cell would be at the fat end and goes to almost the halfway point of the egg. But I'm following Sally's advice and I will leave it upright in the carton for hatching.