T o d d P a t t i s t wrote:
It's my understanding that this procedure is also used in
airplanes in the U.K. In the U.S., airplanes will only use
QNH or QNE (above 18,000') and never use QFE.

There is always an exception to any rule. American Airlines used to
always use QFE set altimeter for approach and landing in US. I was
involved in the development of the MD-11. We developed an altimeter
setting system that allowed easy transition between QFE, QNH and STD
for the glass cockpit altimeters. American was the only US operator
that used that customer option. They would land at Denver with
altimeter reading zero after getting QFE setting from local ground ops.
(I was involved in development and flight test, not American's ops, so
any America Airlines pilots on this forum may correct this).

Andy