Karaoke enthusiast John Hetlinger, a former Navy pilot and aerospace engineer who helped repair the Hubble Telescope, said appearing on the show "would be probably the high point of my life and my many careers." 

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A MARTA operator is seen inside the control room of one of the new MARTA trains during the unveiling of these trains on Thursday, Jan. 30, 2025. (Miguel Martinez/AJC)

Credit: Miguel Martinez-Jimenez