Five Democratic senators wrote to Transportation Secretary Elaine Chao Elaine Lan ChaoChick-fil-A drops fight for San Antonio airport location Overnight Defense: US marks 19th anniversary of 9/11 attacks | Trump awards Medal of Honor to Army Ranger for hostage rescue mission | Bahrain, Israel normalizing diplomatic ties Trump marks 9/11 with moment of silence on Air Force One, remarks in PA MORE on Friday, asking her to take steps to improve price competition among airlines.

Sens. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (Mass.), Richard Blumenthal (Conn.), Ed Markey Edward (Ed) John MarkeyA game theorist's advice to President Trump on filling the Supreme Court seat Watchdog confirms State Dept. canceled award for journalist who criticized Trump 3 reasons why Biden is misreading the politics of court packing MORE (Mass.), Ron Wyden Ronald (Ron) Lee WydenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (Ore.) and Dianne Feinstein Dianne Emiel FeinsteinTrump plans to pick Amy Coney Barrett to replace Ginsburg on court Trump faces tricky choice on Supreme Court pick The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' MORE (Calif.) asked the Department of Transportation (DOT) to reinstate a 2016 Request for Information (RFI) that was suspended in 2017.

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The request would study whether airlines restrict "distribution or display of airline flight information" and whether that "constitute(s) an unfair and deceptive business practice and/or an unfair method of competition."

“The traveling public depends on third-party price comparison sites to make apples-to-apples comparisons among fares and flights and to select the best price, schedule, and airport from all available options,” they wrote in their letter.

“Unfortunately, some airlines appear to be taking steps to restrict consumer access to fare and schedule information on such sites. We strongly urge the Department of Transportation to lift the RFI suspension and continue exploring industry practices on distribution and display of airline fare, schedule, and availability information," the senators added. "We also urge the DOT to use its existing statutory authority to protect consumers from unfair or deceptive practices, or unfair methods of competition upon conclusion of this proceeding.”

The letter was sent the Friday before Labor Day weekend, when many Americans travel.

The Hill has reached out to the Transportation Department for comment.