For 14 years, a federal rule has required that the first airfare you see is the full airfare — taxes, fees, everything. On Friday, the public comment window closed on a Department of Transportation proposal that would loosen that rule, and possibly eliminate it altogether. By Wednesday, 1,309 comments had landed in the docket.
The proposal, published in the Federal Register on July 1 under the plain-spoken docket title “Full Fare Rule Revision,” is narrow on its face and sweeping in its fine print. On its face, it changes how big the fine print can be. In its fine print, DOT says it is “considering repealing the Full Fare Rule in whole.”
What the Full Fare Rule actually does
Adopted in 2011 and effective in 2012, the rule (14 CFR 399.84) declares it “an unfair and deceptive practice” for an airline or ticket agent to advertise any price for air travel “unless the price stated is the entire price to be paid.” Airlines may break out taxes and fees separately — but under the current text, those components “may not be displayed prominently” and may not appear in the same or larger type than the total. In practice: the total price must be the biggest number on the page.
Batmandir · Guest Passes Step inside for a day. Guest passes from $161/day — brought in by a member. See guest passes →The rationale, in DOT’s own words at the time, was that “consumers felt confused or deceived when the fare provided after an initial air fare inquiry did not reflect the total cost of travel,” and that travelers “need to be able to see the entire price they must pay to get to their destination the first time the air fare is presented to them.” Airlines sued almost immediately. In Spirit Airlines v. DOT (2012), the D.C. Circuit upheld the rule against both arbitrary-and-capricious and First Amendment challenges, and the Supreme Court declined to hear the appeal.
What DOT is proposing
The formal proposal makes three moves:
1. Equal billing for the add-ons. The font-size and prominence restrictions would go. Taxes and fees could “be displayed with the same prominence as the total price itself” — just not more prominently. The requirement to show a total price would remain.
2. Rescinding nine guidance documents. DOT would withdraw every piece of price-advertising guidance its aviation consumer office has issued since 1994 — covering, among other things, the use of “free” in fare ads, rounding, advertising fares on character-limited social media, and a 2012 warning that it is deceptive to label carrier-imposed surcharges as “taxes.” DOT argues some of these “improperly functioned as de facto regulations” that never went through notice and comment.
3. The alternative: full repeal. Beyond the proposed text, DOT “is considering repealing the Full Fare Rule in whole,” and asked commenters to weigh in on that option too.
The 1970 tax law doing the heavy lifting
The most unusual argument in the proposal involves a 56-year-old provision of the Internal Revenue Code. Section 7275, enacted in 1970, already sets standards for how taxes appear in airfare advertising — and DOT concedes it “did not consider this section when it promulgated the Full Fare Rule” in 2011.
Under the tax code’s standard, if an ad breaks out the fare and the taxes separately, the total must be stated “at least as prominently” as either component — a looser standard than DOT’s current rule, which requires the total to dominate. DOT now suggests Congress may have intended the tax code, not aviation regulators, to govern tax-and-fee prominence. The enforcement mechanism, for the record: violating Section 7275 is a misdemeanor carrying a maximum penalty of $100 per violation.
The proposal also leans on newer constitutional ground. DOT says the prominence requirements raise “serious constitutional difficulties” under the First Amendment, citing the Supreme Court’s 2018 NIFLA v. Becerra decision on compelled speech, and argues that airlines have a First Amendment interest “in calling greater attention to the portion of air fare that is attributable to government-imposed taxes and fees.” It adds that after Loper Bright ended Chevron deference in 2024, the deference the Spirit court gave DOT in 2012 “is now questionable.” The rulemaking is framed as a deregulatory action under two February 2025 executive orders, including EO 14219, which directs agencies to identify rules that raise constitutional problems.
Who wants this — and who doesn’t
The industry is not united, which is the most interesting wrinkle in the docket.
Pushing for repeal: Airlines for America (the major carriers’ trade group) and IATA, which told DOT in an earlier request for information that the rule effectively “requires airlines to hide some of the true cost to consumers.” Spirit Airlines and the Association of Value Airlines — Allegiant, Avelo, Breeze, Frontier, Spirit and Sun Country — went further, arguing the rule “unconstitutionally abridges commercial speech.”
On the other side: the Travel Technology Association, representing booking sites and online travel agencies, argued for keeping the rule. And in its July request to extend the comment deadline, Southwest Airlines — a carrier, not a consumer group — told DOT that repealing the Full Fare Rule “14 years after it has gone into effect would be extremely disruptive” and said it preliminarily opposes rescinding the nine guidance documents. Five consumer organizations, including the Consumer Federation of America and FlyersRights, defended the rule in the earlier proceeding on the grounds that without price transparency, “consumers cannot make informed decisions and competition fails.”
The comment period itself was extended once, from July 31 to August 21, after A4A, Southwest and Travel Tech all asked for more time — in part because DOT had not posted its own Regulatory Impact Analysis to the docket until July 24, more than three weeks after the proposal published.
Against the junk-fee tide
The proposal runs opposite to the direction most price-transparency regulation has moved. The FTC’s junk-fees rule, in effect since May 2025 for event tickets and short-term lodging, requires the total price to be shown “more prominently than any other pricing information” — stricter than what DOT now proposes for airfares. New York City’s consumer agency, meanwhile, spent this summer advancing an all-in pricing rule of its own aimed at delivery apps. Airfare advertising, if this proposal is finalized, would become the notable federal exception: the one marketplace where the government once required the full price up front and then decided it didn’t need to.
DOT’s own preamble contains no dollar estimate of what consumers would gain or lose; it points to a Regulatory Impact Analysis in the docket and asks commenters what “quantifiable or qualitative cost-savings” repeal would produce. Even under full repeal, DOT notes, it could still bring case-by-case enforcement against fee displays it finds unfair or deceptive under its general statutory authority.
What happens next
With comments closed, DOT will review the docket and decide whether to finalize the rule as proposed, go further toward repeal, or step back. Any final rule is a strong candidate for litigation — this time with the airlines’ 2012 courtroom loss looking, by DOT’s own telling, considerably less secure.
Sources and methodology: U.S. Department of Transportation, “Enhancing Flexibility of Air Fare Price Advertising,” Notice of Proposed Rulemaking, 91 FR 39932 (July 1, 2026), and extension of comment period, 91 FR 48319 (July 31, 2026), Docket DOT-OST-2025-0831; DOT Office of Aviation Consumer Protection. Comment count (1,309) is the Regulations.gov figure displayed as of August 20, 2026. Quotes from RFI commenters are as characterized in the NPRM. Spirit Airlines v. DOT, 687 F.3d 403 (D.C. Cir. 2012).
