Sydney - The search zone for the missing Malaysia Airlines plane has been limited to a narrow strip of the Indian Ocean, with the authorities confident that they will find the aircraft “in a matter of days” after two new sets of underwater signals were detected. :snip: They have all been heard within an area about 20 miles long and 10 miles wide, about 650 miles off the north-west coast of Australia, although a final search zone is yet to be demarcated. :snip: All the signals have been detected along a narrow strip of the Indian Ocean in an area...