Some parts of the air show are being limited at Thunder Over Louisville this year because of the height of the new tower being built as part of the Ohio River Bridge Project.
Aimee Boyd of the Kentucky Derby Festival told The Courier-Journal that the U.S. Air Force Thunderbirds will be in the April 18 show but won't be able to perform the full aerobatic show.
Organizers say the Federal Aviation Administration has limited movement of some of the largest and fastest aircraft. Boyd says the restrictions apply to the kinds of planes used by the Thunderbirds and The Blue Angels, the Navy's flight demonstration squadron.
The Thunderbirds last performed at Thunder in 1997.
Boyd says the festival will work with the FAA in the future to find ways for the planes to perform their full aerobatic show.
Not all Derby Day events will take place in Louisville on the first Saturday in May.
The 79th annual Governor's Derby Celebration in downtown Frankfort is set for 9 a.m. to 1 p.m. on May 2.
The governor's office says visitors can expect the traditional fare of past Derby Celebrations, such as a farmers' market, arts and crafts, specialty vendors, children's activities and live music.
This year's celebration will also include the Derby Dash, with races for children ages 2 to 12.
Many downtown Frankfort restaurants and stores will be open with unique and traditional Derby offerings during the celebration. Visitors will also be able to tour the Capital City Museum, the Thomas D. Clark History Center, the Old State Capitol and the Old Governor's Mansion -- all located downtown.