(n) :
an aircraft, such as a dirigible or balloon, that derives its lift from buoyancy rather than from wings or rotors; a moored balloon flown in a semi-permanent manner, as a border patrol monitoring balloon affixed at 18,000 feet (~6km)
(n) :
an aircraft, such as a dirigible or balloon, that derives its lift from buoyancy rather than from wings or rotors; a moored balloon flown in a semi-permanent manner, as a border patrol monitoring balloon affixed at 18,000 feet (~6km)