The airlines keep finding new ways to tack on the charges. On 41 days through May 28, 2010, American, Delta, and United have added “peak travel day” surcharges on top of existing fares. The surcharges go as high as $50 each way (on the day after the Super Bowl). Most days it’s closer to $30.

The problem, for airlines, is that the US Congress is starting to take a closer look at these and other fees. Not, alas, because this kind of surcharging misrepresents the price of air travel to consumers. Rather, Congress has noticed that taxes aren’t collected on surcharges the same way they’re assessed on base fares.

If the fees are fare increases in disguise (which fuel surcharges and peak travel surcharges certainly are) then the government has every reason to want its money. Yes, those fees would be passed straight to the the consumer, but it would be logically consistent and fair.

The Government Accountability Office is investigating the surcharges, and public hearings are coming. Airline executives won’t enjoy their time on the stand, but it’s an important debate to have.

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