Kelly was certain the fare was a mistake, what travel experts call an "error fare," but he told his thousands of readers and Twitter followers about the deal. Many booked the flight before United noticed the error.
The thrill of error fares and amazing deals is an added incentive for people to rack up miles and book trips strategically. Kelly said that more than ever, credit-card travel-rewards clubs are trying to attract new customers with sweet bonuses.
We talked with Kelly to learn his tips and tricks for racking up 125,000 miles a year without flying. Trust us, even experienced travelers will be impressed by how experts get the most out of their bonus points.
The credit card game: If you want to rack up miles quickly, you have to be in on the credit card game.
But Kelly doesn't recommend that people in debt get into the game. It's only for people who pay off balances every month.
How many accounts should you open: It's free to open up miles and points accounts with airlines and hotels, and Kelly recommends opening all of them. As for credit cards, Kelly thinks you can open more than you'd expect:
"You're told it will destroy credit. It's not true. If you have a good credit score, there are people like myself who push it to limits. I got four credit cards two weeks ago and eight last year.
If you're not running balances, opening cards will not have a negative impact." But again, you need to keep track of your spending.
Transferable-point credit cards: Not all points are equal. A 30,000-point reward ticket might be 100,000 points at a different airline.
That's why Kelly recommends a transferable-point credit card that allows you to rack up points in a central location and use them anywhere.
Also, a central pool of points gives you flexibility, particularly if you're getting rewards tickets for multiple people.
Kelly recommends Chase Ultimate Rewards and the American Express Membership Rewards cards.
Know your cards: Kelly knows people who keep Post-it Notes on their cards so they know which one to use when spending on travel, gas or dining.
"Many categories give you double or triple miles on certain categories," Kelly said. "It pays to keep up with them."
Grab these cards: If you have excellent credit and are in need of a vacation, what's your excuse for not applying for a credit card that gives you 50,000 bonus points, enough for a free round-trip coach ticket to Europe? (British Airways Visa -- read the fine print and sign up.)
Kelly says StarAlliance points, which share miles among 27 carriers, are valuable, and so are British Airways points, which are interchangeable with American Airlines points. Look for these cards.
How to spend them
Splurge on business class: A first- or business-class ticket can cost in dollars 10 times as much as an economy ticket. But when you pay in miles, you're not going to pay 10 times the points for the upgrade.
Often, it's only double points to fly business class, and many airlines allow you to upgrade your seat with points.
Buy miles: Some airlines let you buy miles and will give bonuses of up to 100 percent when you purchase them. Sometimes it's cheaper to buy miles than a ticket, so check the bonuses before booking.
Shop online: If you're buying an item from Target, did you know you can go to its website through a "mileage mall" and earn double or triple points just for using that portal?
Apple once offered 10 points per dollar through Chase Ultimate Rewards Shopping. Never just shop through a store's website." Kelly recommends Evreward (www.EVReward.com); also check out his site's Beginner's Guide, which lists online portals.
Track them: When you have, say, 10 credit cards attached to mileage programs, you need a mileage manager. Kelly uses Award Wallet (awardwallet.com), a free service that tracks mileage balances and alerts you if miles are expiring. Using Miles (usingmiles.com) and Trip It (tripit.com) are similar.
Jump on it: You cannot spend days pondering deals. "The best deals are only offered for a very limited time," Kelly said.
Read the Web: Use social networks to your advantage. Kelly posts error fares or great bonuses regularly, so follow him on Facebook and Twitter and read the comments and community posts on Flyer Talk (www.flyertalk.com). Expert travelers share information and will alert you to a great deal.