Expedia claims it has the secret to cheap flights. But is it promoting a dangerous—and self-serving—myth?

You can’t hack airfares, but airlines are hacking you

To understand how absurd the idea of airfare hacking is, imagine this: Your car is running on empty. Instead of filling the tank right away, you wait until Sunday because you heard that the prices will dip a few cents lower at midnight. You circle the block, burning more gas all the while, waiting for the digital display to reset.