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The Plane Train connects all concourses and terminals underground, allowing for smooth movement between them. In order to allow time for check-in, security screening, and transit to gates, passengers are advised to arrive at least two hours early for domestic flights and three hours early for international flights. ATL's passenger experience is further improved by family restrooms, pet relief areas, and a variety of dining and shopping options. Delta Airlines ATL Terminal is a major transit hub for millions of Delta passengers annually thanks to its strong infrastructure and extensive service offerings.