Eckhart International Airport

Aircraft should taxi north of the runway to park on the grass ramp adjacent to the Porthill Port of Entry.

• Aircraft should taxi north of the runway to park on the grass ramp adjacent to the Porthill Port of Entry.
• All crew and passengers will be processed inside the FIS.
• Be prepared to present passports, visas, pilot's license, medical certificate, aircraft registration and user fee decal (if appropriate).

Pilots must secure permission to land by contacting CBP directly, during regular office hours, prior to departure from the foreign port or place and at least otwo hours in advance of the anticipated arrival time at K1S1. Permission to land is granted with a tolerance of (+/-) 30 minutes. If your ETA deviates outside these parameters, previously granted permission(s) are invalid and you must contact CBP to re-secure permission to land.

• Porthill Port of Entry regular office hours: Current Hours: 7 days per week 0700-1900
• Sweetgrass Port of Entry operates 24 hours per day, 7 days per week. NOTE: For further detailed information regarding national GA processing standards and procedures, please refer to the CBP Private Aircraft Arrival Information Document or contact GAsupport@cbp.dhs.gov November 10, 2025 Publication Number K1S1-1125 Eckhart International Airport

• Inspection services for the entrance/ arrival of aircraft at Eckhart International Airport are available 7 days per week, 0700-1900 in accordance with the port's permission to land procedures. Commercial aircraft operators departing the U.S. must obtain an outbound clearance by contacting CBP directly.
• Porthill Port of Entry regular office hours: Current Hours: 7 days per week 0700-1900
• Sweetgrass Port of Entry operates 24 hours per day, 7 days per week. NOTE: For further detailed information regarding national GA processing standards and procedures, please refer to the CBP Private Aircraft Arrival Information Document or contact GAsupport@cbp.dhs.gov November 10, 2025 Publication Number K1S1-1125 Eckhart International Airport Pilots must secure permission to land by contacting CBP directly, during regular office hours, prior to departure from the foreign port or place and at least otwo hours in advance of the anticipated arrival time at K1S1. Permission to land is granted with a tolerance of (+/-) 30 minutes. If your ETA deviates outside these parameters, previously granted permission(s) are invalid and you must contact CBP to re-secure permission to land.

• Inspection services for the entrance/ arrival of aircraft at Eckhart International Airport are available 7 days per week, 0700-1900 in accordance with the port's permission to land procedures. Commercial aircraft operators departing the U.S. must obtain an outbound clearance by contacting CBP directly.
• Porthill Port of Entry regular office hours: Current Hours: 7 days per week 0700-1900
• Sweetgrass Port of Entry operates 24 hours per day, 7 days per week. NOTE: For further detailed information regarding national GA processing standards and procedures, please refer to the CBP Private Aircraft Arrival Information Document or contact GAsupport@cbp.dhs.gov November 10, 2025 Publication Number K1S1-1125 Eckhart International Airport