Construction of two of the prototypes was continued to gain flight-test data and the third was allocated to strength testing.
Others warned against being "suicided" — a term that has gained flight on the Web in China to convey a sense of powerlessness in the face of authority.
Brand gained flight experience as an aviator with the U.S. Marine Corps Reserve from 1953 to 1957 and graduated from the U.S. Naval Test Pilot School, Patuxent, Md., in 1963.
Production surged briefly, then lagged again; unemployment remained high, rising prices offset wage gains, a flight of capital set in.
Although, on average, flying is less risky now than it was a decade ago, the big gains in flight safety since the late 1990s have now largely levelled off.
Though air travel emissions now account for only about 5 percent of warming, that fraction is projected to rise significantly, since the volume of air travel is increasing much faster than gains in flight fuel efficiency.
Knowledge gained during flights proved invaluable in debunking its hypotheses.
It might also be hard for airlines to co-ordinate the departure times and destinations of passenger aircraft in a way that would allow them to gain from formation flight.
The results suggest that an effect of diurnal mass gain on alarmed flight speed would be undetectable with the sample sizes used so far.
In recent years, the concept of competency-based training has gained traction in flight schools.
