I don't like this as an alias. "Hanger" is a common misspelling of "hangar", and indeed, there are posts tagged as hanger that are actually hangars (post #2668660, post #2677580). Creating an alias here isn't guaranteed to prevent this sort of mistagging, and besides, we don't really need an alias for a tag with only 30 posts to begin with.
-1 to the alias, +1 to cleaning up hanger and leaving its wiki as a disambiguation page
