American Carriers have a Bridge for air ops, a Navigation Bridge, and IIRC a Flag Bridge since an Admiral is onboard, all on the same island but stacked. I’m just guessing but I’d bet there is a land transportation bridge or bridges clearence issue going into and out of port and that’s their workaround for it perhaps.
No, I read about it. They deliberately split the two, so the Air Boss and his guys wouldn’t be constantly tripping over the navigation bridge crew, and vice versa, in the ladderwells, and also because it’s a lot easier to oversee aircraft recovery operations from the new aft position, where before they had to struggle to see the wire-trap situation. The new more forward position of the navigation bridge also means a better field of view for those guys, who no longer have so much deck to look past to see where they’re going.