> In this case, the rationale for charging solo travelers more is fairly clear: It's just another way for airlines to continue “segmenting” their customers, charging business travelers paying with a corporate card more while offering a better deal to families on the exact same flight.

I think the explanation is wrong and the author is jumping to conclusions. Airlines have long offered "bulk" discounts. Their goal is to fill as many seats on a flight as possible. What we are seeing here is their group pricing creep into their direct sales.