SAVANNAH, Ga. -- Not even a rural festival celebrating the harvest of Georgia's famous sweet onions is safe from the federal budget battle 600 miles away, as automatic cuts are threatening to take away the star attraction for the Vidalia Onion Festival's popular air show: the Navy's daredevil fighter pilots, the Blue Angels.The $85 billion in automatic budget cuts that took effect March 1 have thrown planning for the festival's April 20 air show into a tailspin, just weeks before event, which officials agreed to hold a week earlier than usual so they could book the vaunted group. The Navy plans to cancel Blue Angels shows booked next month in Vidalia and three other cities. And there is a good chance dozens more air shows across the U.S. could get the ax as well, leaving host cities facing threats of lost tourism revenue and dwindling ticket sales."It's going to hurt us," said Marsha Temples, chief organizer of the Vidalia air show, who estimates past festival weekends have drawn 15,000 extra people when the Blue Angels were on the bill. "People like to see the Blues because they put on an absolutely phenomenal show. You have people who actually follow them and a lot of people come from out of town just to see them."While the Blue Angels' spring schedule is in doubt, the Air Force's formation-flying Thunderbirds and the Army's Golden Knights skydivers have canceled their performances outright. Combined, the three teams had booked more than 190 performances between the spring and fall.That has left many air show organizers scrambling to find replacements, such as civilian pilots with loud, fast jets. Uncertainty has forced others to simply cancel.John Cudahy, president of the Virginia-based International Council of Air Shows, said at least 150 U.S. air shows each year count on military performers to draw big crowds.