Are these eggs still Alive?

[Jackrat]

I have a large incubator and I candled today . I have call duck eggs due to hatch next week but there were a few that look odd . I’m afraid to throw them away as I’m not sure if they are dead or not . There seems to be a black line around the air sac . I’ve moved them into another incubator for now .any help would be appreciated.

 

[H-B-O]

Pictures??

 

[spartacus_63]

If they are due to hatch soon, why would you toss them if there is doubt?