"Doug" wrote in message
m...
If I go to Canada and fly a Canadian registered plane, can I fly it in
Canada on my US license?

You cannot fly it in Canada with only your US Certificate/Medical.

http://www.tc.gc.ca/aviation/regserv...01e.htm#401_03

CAR 401.03(1) No person shall act as a flight crew member
or exercise the privileges of a flight crew permit, licence or
rating or a foreign licence validation certificate unless

(a) subject to subsection (2) and sections 401.19 to
401.27, the person is the holder of, and can produce
while so acting and while exercising those privileges,
the appropriate permit, licence or rating and a valid
and appropriate medical certificate; or
(b) the person is the holder of, and can produce while
so acting and while exercising those privileges, an
appropriate foreign licence validation certificate.

But you can get a 'validation' based on a foreign licence'
(the US is a 'contracting state'):

http://www.tc.gc.ca/aviation/regserv...01e.htm#401_03

CAR 401.07(1) Subject to section 6.71 of the Act, if
the holder of a foreign flight crew licence issued by a
contracting state other than Canada meets the applicable
requirements set out in the personnel licensing standards
and is not a permanent resident of Canada, the Minister
shall, on receipt of an application submitted in the form
and manner set out in those standards, issue a foreign
licence validation certificate.

(2) The Minister shall, in accordance with the personnel
licensing standards, specify in a foreign licence validation
certificate the privileges that may be exercised by the
holder of the certificate.

You can fly a US-Registered aircraft in Canada with
your US Certificate/Medical (if you could fly it in
the US with them):

CAR 401.04 No person shall act as a flight crew member or
exercise the privileges of a flight crew licence in Canada
in an aircraft registered in a contracting state other than
Canada, unless the person holds, and can produce
while so acting or while exercising such privileges,
(a) a flight crew permit or licence issued under this
Subpart; or
(b) a flight crew licence, or a document equivalent
to a foreign licence validation certificate, that is issued
under the laws of the contracting state.

You can fly a Canadian registered aircraft in the US with
just your US Certificate/Medical, though:

http://www.landings.com/evird.acgi?p...ase=NO&word=NO

FAR Section 375.21: Airmen.
Members of the flight crew of a foreign civil aircraft
shall have in their personal possession valid airman
certificates or licenses authorizing them to perform
their assigned functions in the aircraft and for the
operation involved issued or rendered valid by the
country of registry of the aircraft or by the United
States. No such flight crew members shall perform
any flight duty within the United States that they are
not currently authorized to perform in the country
issuing or validating the certificate.