There are more than 20 nonimmigrant visa types for people traveling to the United States temporarily. There are many more types of immigrant visas for those coming to live permanently in the United States. The type of Visa you need is determined by the purpose of your intended travel. For an overview of visa types, please see Types of Visas for Temporary Visitors or Visa Types for Immigrants.

If your passport with your admission stamp or paper Form I-94 are lost or stolen, you must get them replaced immediately. There are a number of steps you need to take, learn more, see Lost and Stolen Passports, Visas, and Form I-94s.

Wearing a mask over your nose and mouth is required on planes, buses, trains, and other forms of public transportation traveling into, within, or out of the United States and while indoors at U.S. transportation hubs such as airports and stations. Travelers are not required to wear a mask in outdoor areas of a conveyance (like on open deck areas of a ferry or the uncovered top deck of a bus). 

Yes. Air travel requires spending time in security lines and airport terminals, which can bring you in close contact with other people and frequently touched surfaces. Most viruses and other germs do not spread easily on flights because of how air circulates and is filtered on airplanes. However, social distancing is difficult on crowded flights, and you may have to sit near others (within 6 feet), sometimes for hours. This may increase your risk for exposure to the virus that causes COVID-19.