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United Airlines has started once again imposing higher fees on individual travelers compared to those who travel together or in groups.
The contentious policy, referred to as the 'single tax' by its detractors, was revealed by a consumer rights website earlier this year.
An investigation by Thrifty Travelerdiscovered that United, Delta, and American were all imposing higher prices on solo travelers for the same route compared to those who booked two or more tickets together.
Following the report that caused public disapproval, United and Delta pledged to eliminate the pricing structure and apply identical rates for individuals and couples. American Airlines, on the other hand, continued with the policy.
Now United — the biggest airline in the US — has backed out, according to aanalysis by The Economist.
It is once more imposing an extra cost on individual travelers during weekdays on at least 8 percent of its flights.
The data also revealed that American Airlines implements the 'single tax' more strictly, imposing higher fees on individual travelers on 57 percent of its routes.
Reviewers claim the system unjustly penalizes individuals who fly alone, particularly those traveling on weekdays for business purposes, whereas travelers in groups frequently receive reduced ticket prices.

In recent months, United has encountered a series of controversies — including reducing flight options and selling customer information.
The established airline revealed earlier this summer that it wouldreduce by four in every 100 domestic flightsthis year – attributing the decrease to Americans' reduced desire to travel.
The reductions focus on late-night and early-morning flights due to a decrease in demand for non-peak travel times.
The cuts occurred as United introduceda fresh business class journey, providing benefits like Ossetra caviar, Laurent-Perrier Cuvée Rosé Champagne, plasma face masks, and designer hoodie pajamas for high-end travelers.
In April, a 90-second air traffic control shutdown at United's Newark base led to weeks of delays and compelled the airline toto eliminate 35 daily flights.
In addition to the criticism, an inquiry found that United was one of the airlines that hadsold sensitive passenger data to the federal government.
The Airlines Reporting Corporation (ARC), which is owned by United, Delta, and American, serves as a data broker that gathers passengers' travel information, such as their names, complete flight itineraries, and financial data.
This broker subsequently sold passenger information to Customs and Border Protection under a contract that instructed the agency not to disclose the source of the data.


The Customs and Border Protection agency, which falls under the Department of Homeland Security, states that the information is essential for law enforcement to monitor individuals of concern.
The report stated that Immigration and Customs Enforcement also acquired the data.
"The major airlines — via a questionable data broker they control named ARC — are providing the government with bulk access to Americans' private details, including their travel destinations and the credit cards they use," said Democratic Senator Ron Wyden to 404 Media.
Southwest is also facing the anger of its passengers followingabandoning its half-century policy of free baggage checks.
It came shortly after the budget airline alsoremove its initial first-come, first-served seating policyin an effort to increase revenue by allowing flyers to pay additional fees to select their seats ahead of time or obtain premium legroom.
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