Travel groups and airlines are warning of potential disruption as the US federal government partially shut down after lawmakers failed to reach a deal on funding the Department of Homeland Security (DHS) .Travel groups and airlines are warning of potential disruption as the US federal government partially shut down after lawmakers failed to reach a deal on funding the Department of Homeland Security (DHS) .Travel groups and airlines are warning of potential disruption as the US federal government partially shut down after lawmakers failed to reach a deal on funding the Department of Homeland Security (DHS) .Travel groups and airlines are warning of potential disruption as the US federal government partially shut down after lawmakers failed to reach a deal on funding the Department of Homeland Security (DHS) .Travel groups and airlines are warning of potential disruption as the US federal government partially shut down after lawmakers failed to reach a deal on funding the Department of Homeland Security (DHS) .Travel groups and airlines are warning of potential disruption as the US federal government partially shut down after lawmakers failed to reach a deal on funding the Department of Homeland Security (DHS) .