Enlarge / The Sikorsky-Boeing SB-1 Defiant. (credit: Sikorsky/Boeing) The Sikorsky-Boeing SB-1 Defiant, one of two aircraft competing for the US Army's Future Long Range Assault Aircraft program, has finally made its first flight—a short bit of hovering around an airfield at a Sikorsky facility in West Palm Beach, Florida. The flight comes over 15 months after the Bell V-280 Valor (the other competitor for the program to replace the Sikorsky UH-60 Blackhawk) took flight.