That's a huge wingspan, but not as gigantic as the concept design for a flying atomic powered aircraft carrier, the Lockheed CL-1201. Design wingspan 1,120 ft. Of course, thankfully this craft never made it out of the concept phase. One can imagine about a dozen problems right off the bat including recovering fighter jets while aloft, or the fact this would present a giant target to the enemy.
“Design wingspan 1,120 ft.”
Were they going to assemble it in the air?