for the work in aviation there is a lot of chance that you ll get a three years waiting period before getting a security clearance.
you said you can apply for your permanent resident directly with a company or just the embassy ?
to get a working permit you ll need to have one of the most look for qualifications and work experiences. but i think there is no new applicants before next july 20013. there is over 1 millions requests up to now that has not been treated....
wish you the best.