Saw them last weekend at Seafair. They did a similar thing shown in that first picture. The pilot tilts the nose upwards and apply enough thrust to stay airborne so they move forward at an extreme angle and very, very slowly; it's crazy. I didn't have my SLR w/ telephoto, just a cheapo digicam but I managed to capture a few formation pics.
That 2nd image above is awesome. We saw the Blue Angels transport plane too but I don't recall seeing JATO packs on it. Granted we didn't see the behemoth take off or land. They're pretty darn impressive when flying in tight formation or when they fly towards one another and miss by what I'd fathom is a couple yards at high speed. A few were flying very close to the lake at high speed. Either he was approaching the speed of sound or it was high moisture kicked up from the surface of the lake, but that "sound barrier" mist cloud was starting to form around the plane.