Last week I wrote that American changed its fare rules to charge you more on many connecting itineraries and on trips that include stopovers. In fact, United and Delta have done the same thing, though I also explained how to beat the practice.
In one example I showed you how to save as much as 74% on a ticket. Multi-segment itineraries may now be more expensive than buying each segment separately on these three major US airlines. However you can beat the practice by pricing out each flight segment separately, and if cheaper buying the series of one-way tickets instead of a roundtrip, open jaw, or circle trip.