Basically a charter outfit, for hire.
Most of their fleet was comprised of C-47 and ex mil C-12's (King Airs). They do everything from charter, geo-surveys, and spraying operations.
http://www.dynamicaviation.com/
Dynamic Avlease is a subsid (or) new name for K&K Aircraft, Brdigewater VA.
They started many years ago out of farm airfield, in Coatesville PA.
ref: N40Y Beech A200 Super King Air BP-30 (ex N302PT / 82-23782 )
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One of their Dash-8's