Malaysia : `` Analysis on all four detections is continuing , '' he said . Angus Houston says underwater signals remain ` ` the most promising . '' ` ` Groundbreaking work '' with satellite analysis will help find the plane , he says . Houston questions Malaysia 's response to the missing plane . Inmarsat offers free global airline tracking to all Malaysian commercial passenger planes .
Malaysia : Angus Houston says underwater signals remain ` ` the most promising . '' ` ` Groundbreaking work '' with satellite analysis will help find the plane , he says . Houston questions Malaysia 's response to the missing plane . Inmarsat offers free global airline tracking to all Malaysian commercial passenger planes .