positive impact of fireworks on this concert—particularly the echoing sound—led to the firework show's name when it was held the following year over the Ohio River. In 1991 the event moved to Waterfront Park, and Zambelli Fireworks Internationale's Master Pyrotechnician Raymond M Loffredo began handling the fireworks. The Air Show began in 1992, and has featured such notable aircraft as the Harrier, the B-2 (Stealth Bomber), and the F-117 (Stealth Fighter) as well as the Apache Attack Helicopter. The event expanded rapidly in scale and attendance; by 1996 more shells were exploded in the first minute than in the entire 1990 show. In 1997, the Air Force designated Thunder Over Louisville as one of the events for its 50th anniversary celebration. More than 125 military aircraft performed that year, making it the largest combined fireworks and air show in the United States. The event relies heavily on corporate donations. In 2000, when Kroger pulled out after 10 years of sponsorship, the Kentucky Derby Festival was left scrambling for money. They announced the Thunder Funder program, in which individuals can make small donations. In 2006, McDonald's announced that they would be the title sponsor for Thunder Funder and donate 10 cents from the sale of every 32-ounce drink in a commemorative cup to the Derby Festival. This promotion continued until 2014. In 2015, the restaurant chain pledged $100,000 to the event. The fireworks show has grown in size and scope every year, with over 52,000 shells used in 2004, and 60,000 in 2005. The fireworks show usually lasts 30 minutes. There is traditionally a 3-minute finale which organizers call by the name Gargantuan. This is usually preceded by a short break in the fireworks and an audio score of "The Colonel Bogey March" as whistled in the movie Bridge on the River Kwai, often catching first time spectators, who believe the show has ended, by surprise. The 2007 event had a record crowd, whose size was estimated at 850,000 by the event producer. Such counts do not include thousands of people who watch from area rooftops at "Thunder parties" held by individuals with proximity advantaged addresses in downtown, Old Louisville, Portland and the Butchertown neighborhood immediately upriver from downtown, as well as river adjacent neighborhoods in the Indiana communities of Clarksville and Jeffersonville. In 2010, a computer glitch 30 seconds before the show during a pre-recorded minute long audio countdown to