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United Airlines ATL Terminaloperates from Hartsfield-Jackson Atlanta International Airport's North Terminal (ATL). This terminal is located on the airport's domestic concourse and provides convenient access to check-in, security, and other services for United Airlines passengers.
Actually, Terminals 3 and 4 of Frontier Airlines PHX Terminalare connected by a walkway and the airport's SkyTrain system. This enables for quick access between the two terminals, which is useful for passengers switching between flights or investigating other airline options.