Citizens of Iran and several other countries were temporarily banned from entering the United States by the executive order "Protecting the Nation From Foreign Terrorist Entry Into the United States" of 27 January 2017. The United States also does not allow Iranian citizens or those suspected of being Iranian citizens entry into the US, including Iranian passport holders, except for transit. All passengers and crew members of any nationality should ensure they do not have Iranian entry stamps in their passports. There are no direct flights between Iran and the USA so all travel must transit through a third country, and no Iranian aircraft may enter USA airspace.