3 2 : 4 8 ▁flying ▁hours . ▁ 2 1 ▁March ▁U . S . ▁Navy ▁Naval ▁A ircraft ▁Factory ▁P N - 9 , ▁Bu No ▁A - 6 8 7 8 , ▁flying ▁boat ▁which ▁executed ▁record ▁trip ▁from ▁San ▁Francisco ▁to ▁Hawai i ▁in ▁August – Se ptember ▁ 1 9 2 5 , ▁rep a ired ▁and ▁sh ipped ▁to ▁San ▁Diego , ▁California , ▁crashes ▁and ▁s inks ▁in ▁the ▁ocean ▁this ▁date ▁with ▁total ▁flight ▁time ▁of ▁ 1 9 0 : 2 8 ▁hours . ▁ 2 1 ▁April ▁ ▁Their ▁Royal ▁High ness es ▁visit ▁Australia ▁to ▁open ▁the ▁new ▁Parliament ▁House ▁in ▁Can ber ra . ▁On ▁this ▁date , ▁during ▁their ▁official ▁visit ▁to ▁Melbourne , ▁" and ▁just ▁as ▁the ▁royal ▁process ion ▁was ▁turning ▁from ▁St ▁K ilda ▁Road ▁into ▁the ▁grounds ▁of ▁Government ▁House , ▁two ▁D H . 9 ▁aircraft ▁of ▁the ▁RA AF ▁fly p ast ▁coll ided . ▁The ▁crowd ▁of ▁many ▁thousands ▁watched ▁as ▁A 6 - 5 ▁and ▁A 6 - 2 6 ▁dis integr ated ▁and ▁pl um met ed ▁to ▁earth ▁in ▁the ▁vic inity ▁of ▁St urt ▁Street , ▁South ▁Melbourne . ▁Fort un ately , ▁there ▁were ▁no ▁cas ual ties ▁among ▁the ▁crowd ▁but ▁all ▁four ▁RA AF ▁air cre w ▁were ▁killed ▁making ▁it ▁the ▁worst ▁aircraft ▁accident ▁in ▁Australia ▁to ▁that ▁time ." ▁ 9 ▁May ▁Their ▁Royal ▁High ness es , ▁still ▁in ▁Australia , ▁