Homeland Security Secretary Markwayne Mullin's recent proposal to block international flights from cities that do not comply with federal immigration enforcement has sparked widespread criticism. Initially dismissed as unrealistic, the plan now appears to be gaining traction. Experts from the U.S. Travel Association and Airlines for America warn that removing Customs and Border Protection (CBP) agents from international airports could have a 'devastating effect' on the airline and tourism industries. Major airlines have swiftly condemned the proposal, citing potential operational disruptions and economic damage. Transportation Secretary Sean Duffy also expressed skepticism, emphasizing that air travel should not be restricted based on political disagreements. The Justice Department's identification of several major airports in cities labeled as sanctuary jurisdictions, including Boston and Newark, has raised further concerns about the feasibility of Mullin's plan. Critics argue that the proposal demonstrates a lack of understanding of global travel logistics and could lead to mass flight cancellations, significantly impacting the economy beyond just the targeted cities.