Mid-July 2001: More G-8 Summit Warnings Describe Plane as Flying Bomb
US intelligence reports another spike in warnings related to the July 20-22 G-8 summit in Genoa, Italy. The reports include specific threats discovered by the head of Russia’s Federal Bodyguard Service that al-Qaeda will try to kill Bush as he attends the summit. [CNN, 3/2002] Two days before the summit begins, the BBC reports: “The huge force of officers and equipment which has been assembled to deal with unrest has been spurred on by a warning that supporters of Saudi dissident Osama bin Laden might attempt an air attack on some of the world leaders present.” [BBC, 7/18/2001] The attack is called off.

July 20-22, 2001: During G-8 Summit, Italian Military Prepare Against Attack from the Sky
The G8 summit is held in Genoa, Italy. Acting on previous warnings that al-Qaeda would attempt to kill President Bush and other leaders, Italian authorities surround the summit with antiaircraft guns. They keep fighters in the air and close off local airspace to all planes. [Los Angeles Times, 9/27/2001] The warnings are taken so seriously that Bush stays overnight on an aircraft carrier offshore, and other world leaders stay on a luxury ship. [CNN, 7/18/2001] No attack occurs. US officials at the time state that the warnings were “unsubstantiated” but after 9/11, they will claim success in preventing an attack. [Los Angeles Times, 9/27/2001]

Other than those two reports that cite protection from the skies, does anyone know of anymore? Previous Presidents, etc...?