"Steven P. McNicoll" wrote:

"Gene Whitt" wrote in message
et...

The main push for a KNOT measure of aircraft speed came from the use of
DME in military aircraft which was always slant range to a
military VOR known as a TACAN."


TACAN development began in 1947, the military switched to knots and nautical
miles in 1946.

When did the airlines in the U.S. switch to knots?