Fourth of July app guides spectators through nine-hour air show from NASA jets to B-1 bombers

Hours before U.S. military aircraft are set to take flight over Washington, D.C., an app was launched to help Americans track the monumental Fourth of July aerial flyovers in real-time.

Created by senior White House official Shawn Chittle, the "4th of July Fly Over" app is designed as a companion guide for spectators watching along the National Mall and Washington Monument grounds.

To keep up with the fast-moving aerial acts, the app features an adjustable countdown timer set to the official schedule.

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If the flyovers run late or fast, users can manually adjust the timer, and the app will automatically display which aircraft is coming up next.

Spectators can also use the tool to access photos, history and basic facts about the legendary aircraft roaring overhead.

The app will ser...