To amend title 49, United States Code, to direct the Secretary of Homeland Security to extend a requirement for the prescreening of air passengers to international flights that overfly the United States.

H.R. 3337 would expand federal security protocols to require that international flights passing through United States airspace—even those not landing at a domestic airport—undergo passenger prescreening. Under this bill, the Department of Homeland Security would compare the names of all passengers on these "overflights" against the government’s consolidated terrorist watchlist prior to departure. For the traveling public, this means that international flights between foreign countries that cross over U.S. territory would be subject to the same security vetting standards currently required for flights arriving in or departing from the United States.