These include weight, efficiency, flight ... and fly throughout the night on battery power alone. One interesting potential approach mentioned is to also store energy in the form of altitude ...

But before you consider sneaking off with your partner for a rendezvous among the clouds, let's dive into the legality of this high-altitude ... a plane, individuals can be placed on a no-fly ...

In a secret location, an acoustic sensor array deployed on the seabed at a depth of 1,000 metres (3,280 feet) has successfully detected and tracked a fixed-wing aircraft flying at an altitude of ...

Here's a quick rundown: Pilots must use supplemental oxygen when flying above 12,500 ... systems are ideal for smaller aircraft or only occasional high-altitude flights. These compact units ...