They want to help airlines hide the true cost of their tickets again. This is just stupid: Price transparency on airline tickets could be a thing of the past, as House Republicans push to roll back Obama-era rules that prohibit airlines from advertising anything but their all-in prices, including all required taxes and fees. But Democrats and consumer watchdogs are sounding alarms, saying the change would be a gift to airlines, who could hide the true cost of airfare behind links or fine print — and increase their profits by getting consumers to spend more. “This is a bad idea,” said John Breyault, vice president of public policy, telecommunications and fraud at the National Consumers League. “Price transparency makes it easier for consumers to comparison shop. … We don’t want to have to do algebra and advanced trigonometry to figure out what it costs.” The Republican provision was tucked into a huge Federal Aviation Administration reauthorization package, one of the few bills considered a must-pass this Congress, by members of the House Transportation and Infrastructure Committee. It was amended, however, to leave some of the Obama-era rule intact — under the amendment, airlines would still be required to be open about any airline-imposed mandatory fees, but they would be allowed to strip out governmental taxes and fees from their advertised rates. A spokesperson for the transportation committee chair, Rep. Sam Graves, R-Mo., told NBC News that the provision would allow airlines the same freedom in advertising that other industries enjoy. On Thursday, Reps. Alexandria Ocasio-Cortez, D-N.Y., Chris…