Why the US Navy did not convert Omaha into an anti-aircraft cruiser

Why did the planned Omaha-class anti-aircraft cruiser conversion not proceed?

Atlanta-class construction offered better value, and the US Navy did not face Britain's urgent global convoy requirement for improvised anti-aircraft cruisers.

Converting an Omaha would consume yard time and money on an old hull with awkward internal and weapon arrangements. The United States was already building Atlanta-class cruisers designed around the anti-aircraft mission. Britain accepted comparable conversions because it had exposed convoy routes in the Mediterranean, Atlantic, Arctic, and Indian Ocean and needed protection immediately. Different operational pressure therefore made the same stopgap attractive to one navy and poor value to the other.