Jagged edges on K100D Jpeg subject matter ?

First live shoot with the new K100D.

Noticed plenty of jagged straight edges on the jpegs , is this due to in camera settings ? I have contrast , saturation and sharpness set in the middle of the scales.

The images improved following a run through 3rd party image batch resizer software. Although Adobe Photoshop was used initially no sharpening was done with that particular software.

Any ideas......thanks

Is it dust being thrown up off the runway in the second pic? If not it looks a little worrying

Think you could pull down the highlights a bit in more while hull detail and a nicer sky. Alternatively, invest in a circular polariser.

Thats water off the runway on the Zoom 767 pic

Are you cropping the images?
What size are the originals?

It appears the pixel count is perhaps too low, or converted from a lower number. I've accidentally cropped images and forgot to check when Photoshop sometimes puts a default value of 72dpi in the field.
If you are cropping only slightly smaller than full size, this will take a full size image and turn it into crap.
I make sure I leave the 'Resolution' field blank so that there is no pixel conversion (r3eduction or increasing).