Both companies deny using personal data to set those base fares, saying the differences reflect real-time supply and demand. The system even uses more complicated factors, like time of day or the user’s willingness to pay, to set prices or offer specific products, according to the U.S. House Oversight Committee. Federal lawmakers are also working on legislation that would prohibit companies from using dynamic pricing to set prices and wages. Casar accused Delta Air Lines of using people’s data to set prices, as Straight Arrow previously reported. The company later disputed claims that it used customers’ personal data to set prices.