The place that Howard2107 mentioned is locally kinown as the "Bomb Holes". If you follow his directions, but rather than take the first turn on the left at the top of the hill, travel about 1/4 mile further and there is another entrance on the left which is a bit flatter.
If you park along the track down here, and walk towards the airport fence and follow it along, there is a public foot path that runs around the perimeter of the southern side of the airport. If you walk along for a few minutes, you will eventually come to the 32 threshold from where you can stand and watch the a/c.
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In the pic in the link, the "bomb holes" is the sandy area behind the Multiflight hangers, just to the left of there you can make out a red/white hut and that is roughly where the path starts. Just where the piano keys are at the 32 end, to the right is a small hedgerow - thats where the path takes you to.
