Trump signs travel ban executive order, causing airport chaos as DHS detains travelers without airline or CBP coordination

President Trump signed Executive Order 13769 on January 27, 2017, banning nationals from seven Muslim-majority countries from entering the United States and suspending all refugee admissions for 120 days. DHS was not briefed until hours after the order was signed and was "largely caught by surprise" by the immediate implementation requirement. Airlines had no advance notice and couldn't prevent affected travelers from boarding flights already en route. CBP detained hundreds of travelers at international terminals across the country. Lawyers flooded airport terminals in New York, Los Angeles, Chicago, and Washington. Federal judges issued emergency stays within 48 hours. The chaos at airports built the rapid-response infrastructure the travel and airline industry would deploy eight years later when DHS Secretary Mullin threatened CBP withdrawal from sanctuary city airports.