NO PURCHASE OR PAYMENT OF ANY KIND IS NECESSARY TO ENTER OR WIN. A PURCHASE OR PAYMENT WILL NOT IMPROVE YOUR CHANCES OF WINNING.
Limit one (1) entry per person. If you attempt to enter the Sweepstakes more than once, Sponsor reserves the right to disqualify all of your entries. To enter by mail, you must mail a postcard, first-class postage pre-paid, indicating your name, your residential address, your e-mail address, your telephone number, and the name of the participating program who you want your entry to be associated with as follows:
Joint Points.com And Win Sweepstakes
P.O. Box 543, Saint Charles, Illinois, 60174
Mail-in entries must be received by Sponsor by January 31, 2012. Sponsor reserves the right to reject any entries that are ineligible or otherwise do not conform to the requirements of these Rules, any entries that have been tampered with, any automated or computer-generated script entries, or any entries that are late, misdirected, incomplete, corrupt, lost, or submitted after the Sweepstakes is discontinued.
As of August 1, 2011, the participating loyalty programs and the approximate retail value (ARV) of the prizes are as follows:
Aeroplan® CAD$25,000
Alaska Airlines Mileage Plan US$25,000
American Airlines AAdvantage® US$25,000
Membership Rewards® program from American Express
US$50,000 (Forget that...)
Continental OnePass® US$25,000
Delta SkyMiles® US$25,000
Frontier Airlines EarlyReturns® US$25,000
Hawaiian Airlines® HawaiianMiles® US$25,000
JetBlue TrueBlue US$25,000
Priority Club® Rewards US$12,500
US Airways® Dividend Miles® US$25,000
Virgin America Elevate US$25,000
...And the best part:
In order to be declared a winner, Canadian residents will be required to correctly answer a time-limited skill-testing mathematical question, to be administered by telephone, e-mail or other method at Sponsor's discretion, without mechanical or other assistance. 
You would think a Canadian company wouldn't hate their own people so much!
