Based on the given data, the number of certificated airports in the U.S. is projected to decline steadily from 2024 through 2028. In 2023, the number stood at 491.38, indicating a downward trend. The year-on-year percentage decrease from 2024 to 2028 highlights a consistent reduction, with each year experiencing a similar decline. A 5-year CAGR suggests a modest but persistent contraction in the number of airports over the forecast period.

Future trends to watch for:

Potential impact of technological advancements that might influence the need for airport infrastructure.
Economic factors and policy initiatives that could either mitigate or accelerate the decline.
Environmental considerations and sustainable development pressures which could reshape airport operations.