Two <a href="https://en.wikipedia.org/wiki/Aeroflot" id="mwAQE" rel="mw:WikiLink" title="Aeroflot">Aeroflot</a> <a href="https://en.wikipedia.org/wiki/Tupolev_Tu-134" id="mwAQI" rel="mw:WikiLink" title="Tupolev Tu-134">Tupolev Tu-134s</a> <a href="https://en.wikipedia.org/wiki/1979_Dniprodzerzhynsk_mid-air_collision" id="mwAQM" rel="mw:WikiLink" title="1979 Dniprodzerzhynsk mid-air collision">collide</a> over the <a href="https://en.wikipedia.org/wiki/Ukraine" id="mwAQQ" rel="mw:WikiLink" title="Ukraine">Ukrainian</a> city of <a href="https://en.wikipedia.org/wiki/Kamianske" id="mwAQU" rel="mw:WikiLink" title="Kamianske">Dniprodzerzhynsk</a> and crash, killing all 178 aboard both airliners.