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The abbreviation for the Airport Line is typically recognized as "APT," which stands for Airport. This designation is commonly used in transportation systems to clearly indicate services related to the airport, facilitating clear communication and signage. Using "APT" helps passengers identify and understand that the line connects to an airport, differentiating it from other service lines.

The other options do not accurately reflect the Airport Line. While some abbreviations may pertain to other transportation services or lines, "APT" is specifically associated with airport service, making it the most relevant and correct choice for identifying the Airport Line. Understanding these abbreviations is crucial for effective navigation and communication in transportation networks.