jj
canadian commercial requires that you have all the minimum time for the rating (which a 4striper like yourself surely possess) and that you complete the one canadian commercial written, medical exam identical to faa one, and do one flight test on a se piston.
the canadian atp requires two lengthy and challenging written exams, but no flight test if you have a current multi engine instrument rating.
call:
dept of transport pacific region, fcl
666-5571
professional ifr does excellent and entertaining canadian atp courses monthly out of vancouver bc.
1-800-298-7437 or (604)946-5110
www.proifr.com
good luck
markus