Article Excerpt: "... According to the application filed this week, the 65,000-pound payload is too large to be accommodated by any U.S. commercial aircraft...The Russian airline said its services are urgently needed to deliver the Atlas V fuel tank from Huntsville, Alabama, to NASA's Shuttle Landing Facility in Titusville, Florida, or Cape Canaveral, Florida, in mid-May. United Launch Alliance, a joint venture between Lockheed Martin and Boeing Co., manufactures the booster in Huntsville..."
Reference: yahoo.com
More Reading: Russia to supply US with six RD-180 rocket engines this year; Space Daily; Jan 23, 2020.