Air and Water Show

 Spectators watch as the U.S. Air Force Thunderbirds perform during the Chicago Air and Water Show at North Avenue Beach Sunday, Aug. 19, 2018, in Chicago. (Erin Hooley/Chicago Tribune)

Spectators watch as the U.S. Air Force Thunderbirds perform during the Chicago Air and Water Show at North Avenue Beach Sunday, Aug. 19, 2018, in Chicago. (Erin Hooley/Chicago Tribune)

 Levon Moore, 3, sticks his fingers in his ears as the U.S. Air Force Thunderbirds perform during the Chicago Air and Water Show at North Avenue Beach Sunday, Aug. 19, 2018, in Chicago. (Erin Hooley/Chicago Tribune)

Levon Moore, 3, sticks his fingers in his ears as the U.S. Air Force Thunderbirds perform during the Chicago Air and Water Show at North Avenue Beach Sunday, Aug. 19, 2018, in Chicago. (Erin Hooley/Chicago Tribune)

 The U.S. Air Force Thunderbirds perform during the Chicago Air and Water Show at North Avenue Beach Sunday, Aug. 19, 2018, in Chicago. (Erin Hooley/Chicago Tribune)

The U.S. Air Force Thunderbirds perform during the Chicago Air and Water Show at North Avenue Beach Sunday, Aug. 19, 2018, in Chicago. (Erin Hooley/Chicago Tribune)

 Spectators watch as the AeroShell Aerobatic Team performs during the Chicago Air and Water Show at North Avenue Beach Sunday, Aug. 19, 2018, in Chicago. (Erin Hooley/Chicago Tribune)

Spectators watch as the AeroShell Aerobatic Team performs during the Chicago Air and Water Show at North Avenue Beach Sunday, Aug. 19, 2018, in Chicago. (Erin Hooley/Chicago Tribune)

 A spectator watches through shades during the Chicago Air and Water Show at North Avenue Beach Sunday, Aug. 19, 2018, in Chicago. (Erin Hooley/Chicago Tribune)

A spectator watches through shades during the Chicago Air and Water Show at North Avenue Beach Sunday, Aug. 19, 2018, in Chicago. (Erin Hooley/Chicago Tribune)

 The AeroShell Aerobatic Team performs during the Chicago Air and Water Show at North Avenue Beach Sunday, Aug. 19, 2018, in Chicago. (Erin Hooley/Chicago Tribune)

The AeroShell Aerobatic Team performs during the Chicago Air and Water Show at North Avenue Beach Sunday, Aug. 19, 2018, in Chicago. (Erin Hooley/Chicago Tribune)

 A member of the U.S. Army Parachute Team Golden Knights carries a Red Line flag, representing the sacrifices of firefighters and first responders, as he descends during the Chicago Air and Water Show at North Avenue Beach Sunday, Aug. 19, 2018, in Chicago. The flag was presented to Chicago Fire Department Deputy District Chief Ron Dorneker and members of the fire department Special Operations SCUBA team in honor of Juan Bucio, who lost his life while attempting a dive rescue in May, and all of Chicago's fallen firefighters and first responders. (Erin Hooley/Chicago Tribune)

A member of the U.S. Army Parachute Team Golden Knights carries a Red Line flag, representing the sacrifices of firefighters and first responders, as he descends during the Chicago Air and Water Show at North Avenue Beach Sunday, Aug. 19, 2018, in Chicago. The flag was presented to Chicago Fire Department Deputy District Chief Ron Dorneker and members of the fire department Special Operations SCUBA team in honor of Juan Bucio, who lost his life while attempting a dive rescue in May, and all of Chicago's fallen firefighters and first responders. (Erin Hooley/Chicago Tribune)

Thousands of people gathered to watch the 60th annual Chicago Air and Water Show at North Avenue Beach Sunday, Aug. 19, 2018, in Chicago.