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The Air Force Thunderbirds honor frontline workers by flying over Denver on April 18.

The Air Force Thunderbirds honor frontline workers by flying over Denver on April 18.

The Air Force Thunderbirds honor frontline workers by flying over Denver on April 18.

The Air Force Thunderbirds honor frontline workers by flying over Denver on April 18.

The Air Force Thunderbirds honor frontline workers by flying over Denver on April 18.

Thunderbirds flying over Boulder on April 18, 2020.

Thunderbirds flying over Boulder on April 18, 2020.

Thunderbirds flying over Boulder on April 18, 2020.

The class of 2020 toss their caps into the air as the Thunderbirds fly over Saturday, April 18, 2020, at the conclusion of the Air Force Academy graduation in Colorado Springs, Colo. Nearly 1,000 cadets graduated in a scaled-down ceremony due to the coronavirus pandemic. Saturday's commencement was attended by Vice President Mike Pence and capped a difficult final semester in which the cadets attended virtual classes and ate their meals alone in dorm rooms.

Thunderbirds flying over Lakewood with Denver in the background