Bars in the Cities (Anc, JNU, FAI [I think]..) have normal closing times of like 2-3AM.

Bars outside of urban areas stay open til 5am in places like Wasilla, Palmer, just outside of Nome.

I have been cutoff on a few flights. I am a nervous flyer so I tend to overdrink while flying. Its a little bit of an annoyance but I understand why the FA's don't want to overserve people.

I have also been denied drinks on early flights. I remember on the old flt 151 ANC-OTZ that departed at 630am I was denied a drink in FC (for some reason it wasn't a combi that day) because it was too early.