and eggs #1 and 2 look like tat... but egg @2 got cracked, so I thought it might be because of that. 
hope I'm wrong though . Good luck .
Air cell is more normal than the chick development . A sixteen day egg should be much more developed than that . Your hand turning . Keep turning that one until the others pip. Stop turning it then . Raise the humidity on either day eighteen or nineteen . The air cell is large enough the higher humidity shouldn't hurt the egg . Hope it hatches for you . I feel however that its more likely not to hatch than to hatch .
Mind if I ask what temperature you have been running your incubator at ? And what was the temperature was at the top of the eggs ? Also forced air or still air incubator ?
forced air it runs at 38.1 but sometimes it goes to 38.3 no more than that
I would too . I will tell you this Temperature should be taken and maintained at the top of the egg . I can tell that this egg sets lower in the incubator than the others . And believe it or not because the temperature being taken at the top of the largest egg. Eggs setting lower than the others does make a difference in the time it takes them to develop. It is more noticeable in a still air hand turned incubation than in a forced air upright auto turner . This could be the reason for your slow developer or it could be something else . But for a first incubation you have done good getting them to this point.
Your running just a touch high not to bad if your thermometer is accurate . If this temperature is at the top of the eggs . development should be fairly normal. Temperature is so important . It is critical that temperature at egg top level be as close to perfect as you can get it . I'll be watching for hatch results to see how these hatches go . Here's hoping your hatch rate is awesome
Good luck
