hey, I hear air canada is big on french. I know someone who didn't get a job with them because he could not speak french. (or thats wat he told me..don't know what the truth really is. maybe he just bombed his interview) If anything your knowledge of spanish will help you learn another language. Try taking some french classes in university or buy some french language software. Good luck! I hear seneca has a good program.
btw you may want to check out this forum..
www.pprune.org . check out the canada section. Theres probably a bunch of AC guys on there.