Paul,
Last year, we made two trips (NY-MI-NY, NY-MI-MN-IL-NY) under VFR
flight plans. This year, we made another two trips (NY-MI-IL-NY and
NY-MI-CO-MI-NY) but under IFR flight plans. For the firsrt two trips,
we flew over Canada for at least 1/3 of the distance and were in
contact with Canadian ATC (under flight following). For the last two
trips, we were further south and were only over Canada for short
durations. We have not received any bills from NavCanada. I recalled
reading some older posts that the $15 fee applied for aircraft landing
in Canada.

Hai Longworth