CIBC Aventura Flight Redemption Offers:

The offers based on the banner from the CIBC Rewards website states that you can fly on Porter between Toronto and New York for only 8,500 points as well as Chicago, Mont Tremblant and Burlington, VT for 10,000 points. Now, I am not a CIBC Aventura cardholder so I cannot tell you whether that is one way or round trip although I'm guessing round trip based on the Aventura award chart nor do I know the dates of the offer

https://rewards.cibcrewards.com/Home.aspx

Here is an update posted by a Rewards Canada reader over on my blog:
Terms are you have to travel with Porter Airlines by March 31, 2014. The travel date has to be at least 21 days from the date of booking and you have to book through the call center. You are unable to book it online. The 8500 and 10000 points are for round trips.