Four trips from Darwin to Calcutta and back before Christmas is the schedule of the big Douglas DC3 airliner, Kurana, which has been chartered from Australian national airways by imperial airways to help cope with the huge bulk of Christmas mails from overseas. Today's picture at Essendon is of the interior of the airliner stripped of its seats and other fitting in preparation for the mail transport. This year will mark the first occasion on which all first class Christmas mails from Great Brita