They didn't need to fly test flights. That would be big $$ and take time.
But apparently, their hardware is installed on plenty of airplanes, so they just needed to study normal flights north and south in the region to establish a baseline to which to compare MH370's data.
And it was that data that lead them to conclude that the southern route was likely the one MH360 actually took.
But apparently, their hardware is installed on plenty of airplanes, so they just needed to study normal flights north and south in the region to establish a baseline to which to compare MH370's data.
And it was that data that lead them to conclude that the southern route was likely the one MH360 actually took.