This vehicle don't need a runway to land. it can land anywhere on any
surface. Moreover such planes can hover, stay for up to three to five
days in the sky, Don't explode because Helium is used instead of Hydrogen
and more importantly, these are cost effective in term of using fuel.
it consume 70 percent less fuel than conventional planes. Besides these
qualities, these aircrafts are suitable for surveillance. Apparently
American military has contracted with hybrid air vehicle company to buy