Invicta  International Airlines
... that only one of the twenty-five aircraft operated by Invicta International Airlines was a jet, a Boeing 720B?
...  that only one of the twenty-five <a href="./Aircraft" id="mwAwI" rel="mw:WikiLink" title="Aircraft">aircraft</a> operated by <b id="mwAwM"><a href="./Invicta_International_Airlines" id="mwAwQ" rel="mw:WikiLink" title="Invicta International Airlines">Invicta  International Airlines</a></b> was a <a href="./Jet_aircraft" id="mwAwU" rel="mw:WikiLink" title="Jet aircraft">jet</a>, a <a href="./Boeing_720" id="mwAwY" rel="mw:WikiLink" title="Boeing 720">Boeing<span id="mwAwc" typeof="mw:Entity"> </span>720B</a>?