The most dangerous airspaces in the US are often around airports with mountains but also over some leading cities.

Nighthawk would fly to altitudes of up to 4,920 feet (1,500 meters) above the Martian average, covering distances of up to 1.86 miles per flight.

THREE people have been killed after a medical helicopter carrying a patient plunged into the sea in Japan. A further three people including the pilot, nurse and helicopter mechanic were rushed to ...