Points and Miles: September

This is the first monthly summary of the best travel rewards points and miles offers that come my way. Look for it the first Thursday of each month. Now that the busy summer travel season is winding down, we're starting to see more lucrative offers from the airlines and hotel chains. The sputtering economy is also contributing to this.

Delta Airlines has a code, good through December 31, for up to 2,500 SkyMiles and 40% off a Hertz rental. And, also to December 31, beginning with your second stay, you'll receive thousands of bonus SkyMiles for stays at Marriott hotels. You must set your earnings preference to SkyMiles in your Marriott Rewards account.

Until September 18, you can earn as many as 5,000 bonus miles when you convert points from several hotel programs to Aeroplan. All the details are here. Purchases at Home Hardware earn double Aeroplan miles until September 10. And Air Canada will join the major U.S. carriers in charging $25 for the first checked bag, starting October 11.

The big news on the airline mile front is the annual "Grand Slam" promotion from U.S. Airways. Various activities earn hits. Hits earn Dividend Miles, as many as 110,000, if you earn the maximum 40 hits. Registration is open now. Play begins September 14 and continues until November 14. And until September 15, you can earn a 100% bonus on purchased or gifted Dividend Miles, up to 50,000 miles. This also counts as a "hit" if you do it on September 14 or 15.

Starwood Preferred Guest members can earn double the usual points (triple if the stay includes a Thursday or Sunday night) for stays through December 18 at Sheraton, Westin, and other hotels in the Starwood family. Registration is required via this link. And SPG members save 35% and get a free continental breakfast for city weekend getaways, until December 30.

Until November 3, register to get 4X ChoicePrivileges points for stays at Choice Hotels (Comfort Inn, Quality Inn, EconoLodge, etc.).

Here's a code for 15% off at budget chain Red Roof Inn, valid during September for those over 50.

It can sometimes make sense to purchase hotel points to redeem for a reward. For example, you may be only a few points shy of the number needed, or the room rate may be greater than the cost of the points. Until September 30, receive a 20% bonus when purchasing Hyatt Gold Passport points: 1,200 for US$24.

Points.com is not usually a good deal when swapping points among your programs, but until September 15, some swaps earn a 15% bonus, which softens the blow a little. Even with the poor exchange rates Points.com offers, there are times when it's worthwhile: you may have "orphan" points in a program that could provide some value somewhere else, or a swap into a program could count as activity to extend the life of your points in a program. And a swap into U.S. Airways counts as a "hit" for the Grand Slam promotion.

And finally, I don't think PETRO-POINTS have a lot of value (I buy gas at Esso to get Aeroplan miles), but until October 31, when you buy a coffee and swipe your PETRO-POINTS card, you could win free gas for a year.

You can now follow me on Twitter: @AeneasLane