Is this egg in an incubator? If so, is there any way you can add water through a vent or a fan opening without opening the lid? Adding some serious humidity might help the chick get out on it's own.
The problem with peeling off the shell is that if the chick has not yet absorbed fully the yolk sac, it could have a hernia that it won't survive from, or if the blood vessels haven't yet fully contracted, the chick could bleed to death. As most of the time, the airsac does NOT have blood vessels associated with it, you can try to peel back the membrane from the airsac area only. This might open enough of a window to allow the chick to wiggle out. However, do NOT open the lid if you've got more eggs in there! You'll compromise the hatch of all.
Remember, some chicks take more than a day to come out. It's really hard to wait and watch, but generally, nature takes care of it's own.