Citi offers Price Rewind as a free feature on its personal cards like the:

Citi Prestige® Card
Citi ThankYou® Premier Card
Citi ThankYou® Preferred Card
Citi® Hilton HHonors™ Reserve Card, 
Citi® Hilton HHonors™ Visa Signature® Card
Citi® / AAdvantage® Platinum Select® MasterCard®
Citi® Double Cash Card – 18 month BT offer
Citi® / AAdvantage® Executive World Elite™ MasterCard®

It's not a highly publicized benefit, but it can save you a lot of money each year, as proven by our reader success stories in this post.

Basically you register purchases online and if the price drops within 60 days of the

Right Now
Citi Prestige® Card offers American Airlines lounge access on any day you are flying American Airlines flights for you and either your spouse and kids or any two guests.

It also offers Priority Pass lounge access worldwide for you and either your spouse and kids or any two guests, no matter what airline you fly.

Full post on Citi Prestige Airport Lounge Access
But Only Until July 23, 2017
The Citi Prestige® Card loses access to American Airlines lounges on July 24, 2017.

Singapore Airlines is altering its routes to the United States in October 2016. Currently, Singapore flies from four American cities to Singapore with stops along the way in Europe and Asia.

San Francisco to Seoul (ICN) to Singapore
San Francisco to Hong Kong to Singapore
Los Angeles to Tokyo (NRT) to Singapore
Houston to Moscow (DME) to Singapore
New York (JFK) to Frankfurt to Singapore

Singapore is making several changes though.

The Hilton 75k offer has expired. For the current top offers, click here.

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You can pay your rent on Radpad via Android Pay with a credit card, now through the end of this year, completely FEE FREE.

For many people rent makes up a large portion of monthly spending, but they avoid processing it through any sort of application because of fees.

I just booked myself a $1,233 economy flight from Hawaii to Chicago for 17,500 Singapore miles and $5.

You probably already have the miles I used, so you're only a 10 minute phone call away from a trip to Hawaii that costs thousands of miles fewer than it "should."

The basic idea is that you don't want to use United, American Airlines, or Delta miles to fly to Hawaii. You want to use their planes, but you want to book those flights with miles issued by foreign airlines, which for whatever reason, offer far cheaper award prices to

Recently I reviewed the improved offer on the Citi® / AAdvantage® Executive World Elite™ MasterCard®, which now offers 60,000 bonus American Airlines after spending $5,000 in the first three months.

The Citi® / AAdvantage® Executive World Elite™ MasterCard® offers American Airlines lounge access, but comes with a $450 fee.

Singapore Airlines is altering its routes to the United States in October 2016. Currently, Singapore flies from four American cities to Singapore with stops along the way in Europe and Asia.

San Francisco to Seoul (ICN) to Singapore
San Francisco to Hong Kong to Singapore
Los Angeles to Tokyo (NRT) to Singapore
Houston to Moscow (DME) to Singapore
New York (JFK) to Frankfurt to Singapore

Singapore is making several changes though.

British Airways collects fuel surcharges on almost all award redemptions. People constantly complain to me that their recent "free ticket" cost $650 or $1,000 or more in "taxes."

In fact, taxes make up a small share of the cash component of most British Airways awards.

Let’s talk about transferring ThankYou Points to airline partners for redeeming on domestic awards. This is part one in a series that will allow you to master redeeming awards within the United States, no matter what kind of points or miles you might have.
"How to Maximize Domestic Award Redemptions" Series Index

How to Maximize Domestic Award Redemptions Series: ThankYou Points (this post)
How to Maximize Domestic Award Redemptions Series: Ultimate Rewards
How to Maximize Domestic Award Redemptions Series: Membership Rewards
How to Maximize Domestic Award Redemptions Series: SPG Points
How to Maximize Domestic Award Redemptions Series: Conclusions About Best

The Citi Prestige® Card 50k offer expired. You can find the current 40k offer here: Citi Prestige® Card

I've deleted all links from the rest of the post since it is out of date.

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Today (7/19) at 5 PM ET, the Citi Prestige® Card‘s current sign-up offer is changing. I do not know what the future offer will be, but I don’t think this is good news. When we got the same news about the Citi ThankYou Premier in January, its sign up bonus went from 50,000 points to zero.