During one of those missions, on 11 May 2005 the squadron scrambled to intercept an aircraft that wandered into the no-fly zone around the White House. Customs officials had also scrambled a Sikorsky UH-60 Black Hawk helicopter and a UC-35B Cessna Citation jet at 11:47 a.m. to intercept the plane. The Customs aircraft gave way when the F-16s arrived flew on the wing tips of the little plane. They dipped their wings – a pilot's signal to 'follow me' – and tried to raise the pilot on the radio. But the Cessna didn't change course and it was flying too slow for the F-16s. The frustrated pilots had to take turns dropping flares, breaking away and returning to drop more flares. One senior Bush administration counter-terrorism official said it was 'a real finger-biting period' because they came very close to ordering a shot against a general aircraft. Finally, when the Cessna came within three miles of the White House – just a few minutes flying time – it altered course.