involved in a crash
... that in 1972, foggy conditions meant rescue crews at O'Hare International Airport were unaware a second aircraft had been involved in a crash until 28 minutes after the accident?
... that in 1972, foggy conditions meant rescue crews at <a href="./O'Hare_International_Airport" id="mwDEI" rel="mw:WikiLink" title="O'Hare International Airport">O'Hare International Airport</a> were unaware a second aircraft had been <b id="mwDEM"><a class="mw-redirect" href="./1972_Chicago-O'Hare_runway_collision" id="mwDEQ" rel="mw:WikiLink" title="1972 Chicago-O'Hare runway collision">involved in a crash</a></b> until 28 minutes after the accident?