(1) The unit has only ever operated one type of manned aircraft and that is the venerable Hawker Hunter.(2) However, certification only applies to the various types of aircraft, as well as manned balloons.(3) One way is to travel to the planets, either with remotely operated probes or with manned spacecraft.(4) The manned aircraft will operate in long-range, low-level missions, using stealth technologies and terrain screening.(5) It is logical to assume that understanding the solar system environment is just as important to the vision as building the next generation of manned spacecraft.(6) A more sophisticated argument pits robots against manned spacecraft.(7) The first manned spacecraft ever to leave Earth orbit was Apollo 8.(8) The air platforms could take the form of tethered blimps, unmanned aerial vehicles, or manned aircraft.(9) However, satellites did not end the use of manned reconnaissance aircraft.(10) These guidelines specifically exclude manned aircraft but include the export of uninhabited aerial aircraft and related technology.(11) Leaders in Beijing have ordered that the safety of astronauts be ensured first when launching a manned spacecraft, the newspaper said.(12) The Air Force currently suffers from a critical shortage of aviators for manned aircraft.(13) Yet his latest journey was uniquely significant, because he was on his way to see his colleagues send China's first manned spacecraft into orbit.(14) Developing a new manned spacecraft in addition to larger launch vehicles becomes an expensive proposition.(15) Some debate whether such aircraft will eventually replace manned aircraft.(16) By early 1966 the Soviets had not launched a single manned spacecraft in a year.