Even with expected results next week, I don't think there's much more upside to AC at the moment. The market may respond temporarily but not for the same sustained length of time it has. Going from under $2 to around the $9-$10 range has been a pretty good marketing job on the part of AC execs, and good fortunes in the NAmerican industry overall, has meant AC shares have reached a reasonable level. (Of course, reasonable levels don't mean much in the hyped up stock market if a group of investors gets hot about a stock...) Remember, AC had a dip in recent months and only just recovered to this level from the $7 range where it's been most of the spring.
I've got AC and AA shares (which have gone from just under U$20 to the mid-U$30s) plus AE/Aimia and Chorus (spun off from ACE so in the long term with other spin offs cost me little) but am not planning to increase either. I believe AA announced it will start paying dividends but i don't anticipate AC to be doing so since it's run-up has been huge enough to permit some profit-taking. It would be more beneficial to pay down debt and/or refinance the balance sheet in this capital intensive industry.