beacuase it appears that there is some function during the day that can ruin their system. please subscribe if it was helpful
Only when loaded into airplanes.
They do, and there's even a term for it: a red-eye flight.
Human beings. We have no wings, so we use airplanes to fly around.
Only in airplanes like anybody else.
well, in my experiences in the air force, robots not only fly airplanes, the crash them as well. On a more serious not, they often fertilize the airplanes using robo-seaman, which is derived from a navy invention
Because cats do not have the capability to fly airplanes.
Humans. We don't have wings, but we build airplanes and helicopters.
Because people are not able to fly without a airplanes.
You are unable to fly airplanes, however you can fly helicopters.
Tripanes (or any WW1 era plane) could fly at night, but it generally wasn't done. It was extremely dangerous and not worth the risks. However, some airplanes (not triplanes) did fly night intercept missions when the Zepplin raids happened over England.
They both fly. The only difference is that a ballon has helium to make it fly but air planes use gas to make it fly.
Type your answer here... airplanes fly in the stratosphere to avoid weather problems