Pennsylvania Central Airlines Flight 410
... that the crash of Pennsylvania Central Airlines Flight 410 led the Civil Aeronautics Board to establish national minimum flight altitudes?
... that the crash of <b id="mwBaw"><a href="./Pennsylvania_Central_Airlines_Flight_410" id="mwBa0" rel="mw:WikiLink" title="Pennsylvania Central Airlines Flight 410">Pennsylvania Central Airlines Flight 410</a></b> led the <a href="./Civil_Aeronautics_Board#Civil_Aeronautics_Authority" id="mwBa4" rel="mw:WikiLink" title="Civil Aeronautics Board">Civil Aeronautics Board</a> to establish national <a href="./Minimum_en_route_altitude" id="mwBa8" rel="mw:WikiLink" title="Minimum en route altitude">minimum flight altitudes</a>?