Some solo travelers are being charged higher airfares. What you need to know.

Airlines may be charging solo travelers more.

Thrifty Traveler, a well-known travel and flight deal website, exclusively reported last week that major airlines were charging more for passengers booking a single ticket.

“We stumbled upon a new pricing strategy that was not very widespread but no less troubling at the nation’s three largest airlines," Kyle Potter, executive Editor of Thrifty Traveler, told USA TODAY. “This is what they do with all of their fares, they roll things out on a limited basis and slowly expand until it becomes ubiquitous.”

Potter said he wasn't able to get any airlines to go on the record about the specifics behind their pricing policies, and that after his report published, Delta Air Lines and United Airlines eliminated solo pricing rules in their fare classes, leaving American Airlines as the only carrier that still seems to be profiting from the fare differential on some routes.

USA TODAY reached out to the airlines for comment.