also:
http://maps.google.com/maps?ie=UTF8&...p;near=Detroit,+MI&fb=1&cid=0,0,16322681351858239578& ;ll=42.220382,-83.375244&spn=2.774361,5.174561&z=8&iw loc=A&om=1
if you fly directly south from the AIRPORT (where the [censored] else would you fly from?), you will not hit canada. i would challenge the teacher on this for sure.