Fighter jets from the U.S. Navy Blue Angels fly in formation past St. John Cantius Church during practice for the Chicago Air and Water Show, as seen from Milwaukee Ave. and Chicago Ave., Thursday, August 16, 2012, in Chicago. | John J. Kim~Sun-Times

A fighter jet creates vapors as it accelerates during rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, over Lake Michigan. | John J. Kim~Sun-Times

A fighter jet creates vapors as it accelerates during rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, over Lake Michigan. | John J. Kim~Sun-Times

A fighter jet creates vapors as it accelerates during rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, over Lake Michigan. | John J. Kim~Sun-Times

Jodi Stuart holds Abby Hennessy's ears to protect from the noise of fighter jets during rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, at North Ave. Beach. | John J. Kim~Sun-Times

People play in the water as an aerobatic plane flies above during rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, over Lake Michigan. | John J. Kim~Sun-Times

Pilot Sean Tucker flies the Oracle Challenger during rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, over Lake Michigan. | John J. Kim~Sun-Times

A child flips with the aid of an inflated exercise ball during rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, at North Ave. Beach. | John J. Kim~Sun-Times

Two aerobatic planes fly past each other during rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, over Lake Michigan. | John J. Kim~Sun-Times

People watch rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, at North Ave. Beach. | John J. Kim~Sun-Times

A modern fighter jet and an older propeller plane fly close to each other during rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, over Lake Michigan. | John J. Kim~Sun-Times

Photographers aim their lenses during rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, at North Ave. Beach. | John J. Kim~Sun-Times

A woman administers sunscreen on a boy while watching rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, at North Ave. Beach. | John J. Kim~Sun-Times

The Lima Lima flight team flies in formation during rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, over Lake Michigan. | John J. Kim~Sun-Times

The Lima Lima flight team flies in formation during rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, over Lake Michigan. | John J. Kim~Sun-Times

An aerobatic plane flies low on the horizon during rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, over Lake Michigan. | John J. Kim~Sun-Times

People watch rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, at North Ave. Beach. | John J. Kim~Sun-Times

People gather to watch rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, at North Ave. Beach. | John J. Kim~Sun-Times

A parachuter descends during rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, at North Ave. Beach. | John J. Kim~Sun-Times

Fighter jets from the U.S. Navy Blue Angels practice for the Chicago Air and Water Show, as seen from Milwaukee Ave. and Chicago Ave., Thursday, August 16, 2012, in Chicago. | John J. Kim~Sun-Times

People gather to watch rehearsal for the Chicago Air and Water Show Friday, August 17, 2012, at North Ave. Beach. | John J. Kim~Sun-Times