Photo From Trip to Vancouver

And those ARE contrails. The near one looks like it's been there a while and had a chance to be dissipated a bit by the wind. Depending on how much moisture is in the air will determine whether or not, and at what altitude they will form. High moisture in the air = formation at a lower altitude. They will also last longer.

Whether or not you hear the plane that makes them will be dependent on what airplane, altitude it's at, and mostly, wind direction. If they are down wind, and it's a more modern fan jet, you may never hear it, even as it passes overhead.

What's also cool to see is when they are traveling at about the same altitude as the clouds, and cut a swath through the clouds while laying down their own contrail.