DALLAS — A new study by Click Intelligence (CI) has ranked the world’s “worst airlines for passenger satisfaction,” placing American Airlines (AA), Frontier (F9), and United Airlines (UA) in the top three. The ranking is based on a composite “Dissatisfaction Index” that weighs four factors: passenger ratings, Skytrax reviews, online complaint volumes, and accident records.

At first glance, the results echo long-standing traveler sentiment. AA, which carries over 200 million passengers annually, posted the highest dissatisfaction score, while F9 earned the lowest customer experience rating at just 2/10. UA, despite its vast global reach, landed in third place.

CI Top Ten List

CI Dissatisfaction Index

Flawed Metrics, Scale Skew Results against U.S. Carriers?

While the data captures real frustrations—nearly one in four flights worldwide run late, and more than 30 million bags are lost each year—the methodology warrants caution. Skytrax scores, for instance, remain controversial—at least for us, with a history of alleged bias and pay-for-placement practices that call into question their reliability as an industry benchmark.

Moreover, sheer scale may unfairly skew results against U.S. majors. Carriers like AA and UA handle exponentially more passengers than European or Asian counterparts, making them more likely to generate higher complaint volumes and appear “worse” in statistical rankings, not to mention that in the U.S., social media outrage travels faster than ever.

By contrast, low-cost carriers such as Ryanair (FR) and Wizz Air (W6), long criticized for their bare-bones service, appear further down the list, mainly due to their proportional exposure.

CI Destination vs Accidents

A single mishandled bag on a 200-passenger flight will feel very different than one among 200 million. That scale effect makes U.S. carriers especially vulnerable to appearing worse on a purely numerical index. By contrast, low-cost carriers such as Ryanair (FR) or Wizz Air (W6), with reputations for minimal service, can score similarly poor satisfaction ratings yet avoid topping the list due to proportionally lower exposure.

A Grain of Truth

Still, the study captures a truth worth considering: passengers don’t just measure airlines by operational success, but by how airlines handle disruptions.

As Click Intelligence’s James Owen noted, when a delayed flight is followed by a lost bag and poor customer support, the chain of frustrations compounds. This phenomenon transcends geography and market size, and explains why dissatisfaction remains such a stubborn global theme.

While the rankings may overstate the shortcomings of U.S. majors, they highlight a pressing industry challenge: how to rebuild trust with passengers in an era when expectations rise faster than service standards. Numbers alone may not tell the whole story, but the frustration behind them is undeniably real.