prydwen show 1 settler with 76 happiness, is this normal, or is it part of the bug?

Have you sent any companions, such as Danse, to Boston Airport, maybe? I wouldn't know, both my Prydwen and Airport icons say 0 settlers, 50% happiness.

Mine says 1 and about 83% of the Prydwen. It's strange. It doesn't even count as a settlement (at least you can't send anybody there or anything and you can't set up a trade route). Maybe it's Maxson?

danse is at the lighthouse which is where im sending everyone as I meet them again

If you send settlers to the airport they appear in both. I think they are linked due to your ability to travel from the ship to the airport via aircraft