The most likely reason is simply a fast shutter speed. Google Maps imagery is often taken from aircraft, not necessarily from a satellite, and this image looks consistent with an aerial photo.

If the plane was near takeoff or landing, its speed may have been around 200 mph (about 89 m/s). At that speed, a shutter around 1/360 s would limit motion to only a small amount in the image, and 1/400 s or faster is very plausible in bright daylight. That’s enough to make the aircraft look sharp at normal viewing size.

There may also be a little blur present, but not enough to be obvious in the posted map view. Since you’re not looking at a full-resolution, 100% crop, small motion blur can easily be hidden.

It’s also possible the photo was taken from another airplane moving in a similar direction, which would further reduce relative motion. So there’s nothing unusual here: bright light, a reasonably fast shutter, and possibly low relative motion are enough to explain why the plane doesn’t look blurry.