Theorists cite the airport's unusually large size, its distance from Denver city center, as well as assorted alleged Masonic or Satanic symbols, and a set of murals which include depictions of war and death.
Hungarian-American investor George Soros has been the subject of conspiracy theories since the 1990s.
It has been indicated that 17% of people globally believe the theory to be true or partly true.In 2016 the Carnegie Institution for Science published the first-ever peer-reviewed study of chemtrail theory; 76 out of 77 participating atmospheric chemists and geochemists stated that they had seen no evidence to support chemtrail theory, or stated that chemtrail theorists rely on poor sampling.A number of conspiracy theories pertain to a fatal oil-rig industrial accident in 2010 in the Gulf of Mexico, alleging sabotage by those seeking to promote environmentalism, or a strike by North Korean or Russian submarines.Elements of such theories have been suggested or promoted by US radio host Rush Limbaugh and President Donald Trump.There are many unproven conspiracy theories with varying degrees of popularity, frequently related to clandestine government plans and elaborate murder plots.
Conspiracy theories usually deny consensus or cannot be proven using the historical or scientific method, and are not to be confused with research concerning verified conspiracies such as Germany's pretense for invading Poland in World War II.
They are alleged to be implicated in most of the major wars of the last two centuries, to carry out secretly staged events, and to deliberately manipulate economies.
Organizations alleged to be part of the plot include the Federal Reserve System, the Council on Foreign Relations, Trilateral Commission, the Bilderberg Group, and Yale University society Skull and Bones.
The destruction of Korean Air Lines Flight 007 by Soviet jets in 1983 has long drawn the interest of conspiracy theorists.
The theories range from allegations of a planned espionage mission, to a US government cover-up, to the consumption of the passengers' remains by giant crabs.
Conspiracy theory is often considered the opposite of institutional analysis.