[lbahneman]

If it is a plane why does it travel sideways faster than it travels forward? Avoiding that question doesn’t make it go away. I believe I answered that: perspective.

[TigersEye]

Perspective doesn’t explain the time difference. The contrail is obviously degraded from one pic to the next. Yet the “plane” has made almost no forward progress. At 500 mph it should make quite a bit.