Very obvious embryo but no visible air sac?!! HELP

[lucysducks11]

Today is day 7 I candled all 11 eggs which came in the mail, everyone is fertile, I see movement in all 11 eggs and can see the air sac in all but 1
The little embryo is quite active, strong heartbeat, visible eyes spot, nice veins and no air sac? What do I do now???

 

[Yorkshire Coop]

As your other eggs are developing a normal air cell I'm afraid there is not much you can do to change the one that is not. As your eggs were mailed do they have misshapen or saddle air cells?
If the one that looks like it's not developing is not misshapen it may not look quite as big as the others.

 

[lucysducks11]

I will post a picture and you can give me your educated opinion on if there is an air sac or not