it took 2 years to find AF 447 , in a defined area following the discovery of wreckage on the surface. locating the aircraft on the sea floor was'nt a matter of luck either, just the logical result of searching for, and finding, something known to be there. compare that with the 370 situation. no surface wreckage yet to help define a search area on the bottom. it has been mentioned that a sea floor search might not start until some evidence turns up to justify it in a particular area. the present deployment of the towed locator will at least be seen as an attempt to find 370 while the signal from it is still hopefully being transmitted. miracles do happen... but if not this time, the searchers will just buckle down to painstakingly cover a very wide area at 1.5 kts per hour and one day, like AF 447, they will find it... but it could take a lot longer.