Regardless of the frequency of a source of electromagnetic
waves, they are subject to the Doppler effect. The effect was
discovered by the Austrian mathematician and physicist Christian
Doppler (1803-1853).
"People need to understand that aviation system
modernization must be a national priority, but user fees are a
separate and unrelated issue."
Source: Ed Bolen, president and CEO of the
National Business Aviation Association, speaking last week before
an aviation seminar held by the US Chamber of Commerce.
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