There are pictures of aircraft in flight all over Google Earth. They usually move between the color scans, so you get weird things like that.
Seeing signs?
Detecting 100-tons of fuel burning quickly?
It would be a tough job for a pressure detector.
It might show up in an infrared detector scanning for missile launches, although it would be a short track.
If the aircraft was over the ocean, then ocean surveillance radar constellations sweeping overhead should perhaps have seen something from it, although it's moving faster than they would be expecting, and they're probably not going to want to detect aircraft if they can help it.