We've had other sequences where we see the same plane multiple times because of how both it and the camera plane are moving. Not exactly the case here, as those are definitely different planes, but I think something similar may be happening.
Remember, the GMaps are actually a series of many, many images stitched together. We have plenty of examples where it is obvious that adjacent images were taken at signifigantly different times, from Summer/Winter changes to roads with cars on them that appear to suddenly cut off to images of the road being constructed.
In this case, while there is no obvious image seam, my guess is that we again have a time difference in place. One way or another, the images of the two planes wer not taken at the same time, and thus there is actually no collition immenant. Hard to know for certain, but that's my guess for what has happened here.
Satellite Problems 
Remember, the GMaps are actually a series of many, many images stitched together. We have plenty of examples where it is obvious that adjacent images were taken at signifigantly different times, from Summer/Winter changes to roads with cars on them that appear to suddenly cut off to images of the road being constructed.
In this case, while there is no obvious image seam, my guess is that we again have a time difference in place. One way or another, the images of the two planes wer not taken at the same time, and thus there is actually no collition immenant. Hard to know for certain, but that's my guess for what has happened here.