What characterizes signatory carriers in relation to an airport?

Signatory carriers are typically characterized by their investment in infrastructure and operations at an airport. When a carrier is classified as signatory, it means they have entered into a formal agreement, often a lease or use agreement, with the airport authority that typically requires a significant financial investment. This investment could involve funding for terminal space, gate usage, or other facilities that benefit their operations at the airport. This relationship solidifies their commitment to the airport and often entails certain privileges as well as responsibilities, including contributions toward development projects and the maintenance of airport facilities.

The other options hint at other dynamics in the relationship between airlines and airports. Options discussing control over projects or the characteristics of smaller airlines do not accurately represent the formal nature and financial investment that typify signatory carriers. The absence of formal agreements, as mentioned in one choice, directly opposes the concept of signatory status, which requires such agreements as part of the supportive framework for their operations.