Operative word CAN. It doesn’t mean they did. They need to have a reason to pay attention to a given area, the middle of the southern Indian Ocean is generally not on the pay attention list. You can’t rewrite history, if they weren’t taking pictures of the area at the time the plane went down then no footage exists. This is the big difference between the real world and CSI world, in the real world you have to tell the satellite operator you want footage of an area and time BEFORE the satellite is there at that time, in 42 minute solution world the satellites always just HAPPEN to have recorded what our startlingly good looking investigator need to break the case.