Rottnest Island Airport
... that the world's shortest scheduled air route once was from Perth Airport to Rottnest Island Airport, a distance of 32 kilometres (20 mi)?
... that the world's shortest scheduled air route once was from <a href="./Perth_Airport" id="mwA88" rel="mw:WikiLink" title="Perth Airport">Perth Airport</a> to <b id="mwA9A"><a href="./Rottnest_Island_Airport" id="mwA9E" rel="mw:WikiLink" title="Rottnest Island Airport">Rottnest Island Airport</a></b>, a distance of <span about="#mwt15" data-mw='{"parts":[{"template":{"target":{"wt":"convert","href":"./Template:Convert"},"params":{"1":{"wt":"32"},"2":{"wt":"km"}},"i":0}}]}' id="mwA9I" typeof="mw:Transclusion">32 kilometres (20</span><span about="#mwt15" typeof="mw:Entity"> </span><span about="#mwt15">mi)</span>?