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The red hourglass painted on the YF-23 PAV-1 for its maiden flight. Formally designated as the YF-23A, the first aircraft (serial number 87-0800), Prototype Air Vehicle 1 (PAV-1), was rolled out on 22 June 1990; [33] PAV-1 took its 50-minute maiden flight on 27 August with chief test pilot Alfred "Paul" Metz at the controls. [34]