What type of bag is identified as an interline bag in ORD?

An interline bag is specifically categorized as a bag that is transferred between two different airline carriers. In the context of baggage handling at an airport like ORD (O'Hare International Airport), an interline bag allows for the seamless transfer of luggage from one airline to another, particularly when a passenger has booked a journey involving flights on multiple carriers.

Choosing the designation "Interline Bag BX" signifies that this type of bag is intended for a specific handling procedure related to interline agreements between airlines, which ensures coordinated luggage transfers. The nomenclature helps ramp services and baggage handling staff to easily identify and manage these bags accordingly.

The other options do not apply to this context as distinctly as the interline bag does. A transfer bag refers to all bags that might be redirected or transferred but doesn’t specifically denote bags connected through interline agreements. Domestic and international bags refer more to the origin and destination classifications of bags rather than their handling protocols in interline situations. Thus, identifying an interline bag as "Interline Bag BX" accurately reflects its role and requirements in the airline baggage handling process at ORD.