Boeing's newest jetliner, the 777-300ER (extended range), is the fourth all-new 777 model. At the controls for today's first flight were Capts. Frank Santoni and John Cashman. During today's flight Santoni and Cashman took the 777-300ER to an altitude of 15,000 feet (4,572 meters) and an air speed of 0.50 Mach, or about 370 miles (600 kilometers) per hour. The 777-300ER is powered by the world's most powerful commercial jet engine, the GE90-115B. GE Aircraft Engines is the sole producer of engines for the both of Boeing's longer-range 777s, the 777-200LR (longer-range) and 777-300ER.