Yes, U.S. citizens can easily transit through Hamad International Airport (DOH) in Doha, Qatar. If your layover is less than 24 hours and you do not plan to leave the airport's sterile transit area, no visa is required. For those who wish to explore the city during a longer layover, U.S. citizens are eligible for visa-free entry into Qatar for up to 90 days. Furthermore, if you are flying with Qatar Airways and have a layover between 5 and 96 hours, you may be eligible for a free 96-hour transit visa, which is a popular option for travelers wanting to take a quick "stopover" tour. Hamad International is designed for seamless transit, featuring world-class lounges, a transit hotel, and even an indoor tropical garden called the "Orchard." When transiting, ensure your passport is valid for at least six months from your date of arrival, as this is a standard requirement for entering the country or even processing certain transit permits.