Wired.com just did a series of related articles focusing on air travel. This includes some images by Jeffrey Milstein of commercial airplanes taken from directly below near the end (or beginning?) of the runway. On Milstein's own site
jeffreymilstein.com he displays a wider variety of aircraft, and some other non-aircraft related projects. The wired article and extended image gallery is
here.
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Wired also posted this sweet time-lapse representation of flights over the U.S. in a 24 hour period (brighter lines = lower altitude).