Thunder Over Louisville - 4/18/15

The Clark Memorial bridges begins to go dark as the sun sets and the crowd awaits the beginning of the fireworks show during Thunder Over Louisville on Saturday April 18, 2015. © Jason Porter Media

Pilot Bill Leff flies his T-34 "Texan" above the Clark Memorial Bridge using computer-controlled lighting and fireworks to start the fireworks part of Thunder Over Louisville on Saturday April 18, 2015. © Jason Porter Media

Pilot Bill Leff flies his T-34 "Texan" above the Clark Memorial Bridge using computer-controlled lighting and fireworks to start the fireworks part of Thunder Over Louisville on Saturday April 18, 2015. © Jason Porter Media