Solar Challenger
... that the Paul MacCready-designed Solar Challenger was the first solar-powered aircraft capable of sustained, high-altitude flight?
... that the <a href="./Paul_MacCready" id="mwC9Q" rel="mw:WikiLink" title="Paul MacCready">Paul MacCready</a>-designed <b id="mwC9U"><a class="mw-redirect" href="./Solar_Challenger" id="mwC9Y" rel="mw:WikiLink" title="Solar Challenger">Solar Challenger</a></b> was the first <a href="./Solar_power" id="mwC9c" rel="mw:WikiLink" title="Solar power">solar-powered</a> aircraft capable of sustained, high-altitude flight?