Five U.S. carriers — Allegiant, Delta, Southwest, Spirit, and United — do not hold the Department of Transportation’s green-check guarantee for fee-free adjacent family seating. The U.S. Department of Transportation dashboard shows only Alaska, American, Frontier, Hawaiian, and JetBlue with the enforceable commitment for children 13 and under.
The other five may seat families together. They just do not promise it across all fares, at no extra cost, in a codified customer service plan. The dashboard does not say why.
A gate agent at Spirit will often move seats to keep a child next to a parent. A Delta supervisor may reassign a row on request. But “often” and “may” are not the same as an enforceable guarantee — and the government’s own family seating dashboard is built on that exact distinction. It splits U.S. carriers into two groups: those that have written fee-free adjacent seating into their customer service plans, and those that have not.
The second group contains five of the country’s most-booked airlines. Allegiant, Delta, Southwest, Spirit, and United all appear on the dashboard without the green check. All five describe some version of family-seating help. None of those descriptions matches the dashboard’s all-fare, no-extra-cost guarantee. That gap is what travelers are actually choosing between when they book.
Two lists, one dashboard
The DOT’s dashboard is deliberately blunt. A green check means the airline has put a very specific promise in its customer service plan: a child 13 or under sits next to an accompanying adult, without an added fee, whenever adjacent seats are available at booking. It applies across fare types, including basic economy, subject to a few narrow conditions. No such written commitment, no check.
JetBlue, Hawaiian, Frontier, American, and Alaska carry that check right now. The other group — Allegiant, Delta, Southwest, Spirit, and United — does not. That does not mean any of them actively separates children from parents. It means the government has not accepted their family-seating language as binding at the level the dashboard requires.
The dashboard itself offers no explanation for why a carrier is absent. That silence is the story. Travelers see the blank space and fill it with assumptions — usually the wrong ones.
What the five non-committers say in their own policies
Every one of the five has a family-seating policy. The trouble is the language. “We will try” is not the same as “we guarantee.” “Possible” is not “adjacent at booking.” The table below condenses what each carrier publishes today.
| Carrier | DOT green-check guarantee status | Published family-seating promise (carrier language) | Practical handling note |
|---|---|---|---|
| Allegiant | No | Advises reserving seats at booking or via Manage Travel; best effort only. | May be scattered without paid seat selection. |
| Spirit | No | Gate agents and flight attendants will try to seat children 13 and under nearby. | Day-of-travel staff discretion, not a booking guarantee. |
| Delta | No | Policy says adult must sit next to child in same cabin. | Safety framing, not all-fare fee-free guarantee. |
| United | No | Adjacent seating for children 12 and under, including Basic Economy. | Internal practice, not DOT-recognized guarantee. |
| Southwest | No | Will try to seat child 12 and under next to a companion at no extra cost. | Recommends fare types with seat selection. |
| Source: Allegiant Air; Spirit Airlines; Delta Air Lines; United Airlines; Southwest Airlines | |||
Look at Spirit. The carrier’s support guidance says gate agents and flight attendants “will work to provide adjacent seats when possible” for children 13 and under who did not pre-select seats. That is staff discretion on travel day, not a fixed, no-fee adjacent-seat commitment at booking. The difference matters most to a family checking in with two children and a full flight.
United goes further than some. Its system can seat children 12 and under next to an adult in Basic Economy, and if no standard adjacent seats exist, it may open up preferred seats. But that remains an internal operating practice, not a DOT-recognized guarantee. A passenger who books a non-guarantee fare is still relying on the airline’s tools and gate agents, not a codified right.
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Southwest’s family-friendly history, without the green check
The most surprising blank space is Southwest. The airline built decades of brand equity on open seating and family boarding. Its current policy says it “will endeavor” to seat a child 12 and under next to an accompanying passenger 13 and older at no extra cost, according to Southwest Airlines. “Endeavor” is the kind of word lawyers choose when they do not want to promise an outcome.
The dashboard does not explain why Southwest has not adopted the formal guarantee. No verified reason surfaces in public filings or DOT materials. That is the central gap: a carrier with a history of family-friendly boarding still sits outside the enforceable-commitment list, and the dashboard offers no narrative, only the blank space. Travelers who remember Southwest’s old boarding groups may assume the family promise is stronger than it currently is.
What the dashboard actually binds — and what it cannot show
The green check lives inside a customer service plan, not a statute. There is no finalized U.S. regulation that requires every airline to seat a child next to an accompanying adult at no fee. The dashboard reflects voluntary written commitments that the DOT has reviewed and classified. That is a powerful disclosure tool, but it is not a fare rule.
DOT has proposed exactly that rule. The notice of proposed rulemaking in the Federal Register would require airlines to seat children 13 and under next to an accompanying adult at no additional cost beyond the fare, with limited exceptions, and would allow penalties for carriers that charge family-seating fees. The proposal is separate from the current dashboard. It may reshape the landscape; it has not yet become final.
The dashboard also has a blind spot. It shows which airlines have committed. It does not compare actual success rates. No data on the dashboard tells you how often a guarantee airline still separates a family or how often a non-guarantee airline keeps one together. Consumer Reports reviewed 136 DOT family seating complaints filed between March 2016 and November 2018, with many involving American, Delta, and United. Among the episodes: a child in a middle seat away from both parents on a Delta flight, and a United child seated next to a stranger until a crew member intervened. Those cases generated public pressure and helped push DOT toward the dashboard and the proposed rule, but they did not by themselves trigger carrier-specific fines.
What this means for you
Before you book, check the live federal dashboard. The list can change, and airline policies shift. If your airline holds a green check, you have a written, fee-free adjacent seating commitment for a child 13 or under — subject to adjacent seats being available at booking.
If you are booking one of the five non-guarantee carriers, treat family seating as a planning task, not an assumption. Pay for seat selection where it matters, or be ready to work with gate agents on travel day. The policies of Allegiant, Delta, Southwest, Spirit, and United all leave room for “best effort” outcomes that are not a promise.
If a family is separated and the airline will not resolve it, complain to the carrier first. If that fails, file a complaint with DOT’s aviation consumer protection office. A pending rule could eventually create stronger rebooking and refund rights for children 13 and under, but as of now, no such finalized protection exists.
Questions? Answers.
Do airlines legally have to sit families together?
No finalized U.S. regulation requires every airline to seat children next to accompanying adults. DOT’s green-check commitments are voluntary, and a proposed rule would create such a mandate but is still pending.
What airlines guarantee family seating?
Currently, Alaska, American, Frontier, Hawaiian, and JetBlue hold DOT’s green-check guarantee for fee-free adjacent seating for a child 13 or under with an accompanying adult. Allegiant, Delta, Southwest, Spirit, and United do not.
Does Delta guarantee family seating?
No. Delta’s children travel policy says an accompanying adult must sit next to the child in the same cabin, but it is not listed on DOT’s green-check dashboard and does not meet the all-fare, fee-free guarantee.
