Boarding Zones and Groups, Airline by Airline

Every carrier we track now assigns seats.Alaska, Allegiant, American, Delta, Frontier, JetBlue, Southwest, and United all sell an assigned seat with your ticket, which means boarding order is only about when you're invited to walk down the jet bridge. Your seat doesn't change based on where you are in the queue. That is a genuinely new state of affairs: Southwest was the last major US holdout, and it ended open seating on January 27, 2026.

If you haven't flown Southwest since early 2026, forget everything you knew. The A/B/C boarding positions, the numbered pole you lined up against at the gate, and the check-in-exactly-24-hours-early scramble are all gone. Southwest now assigns seats at booking and boards in eight numbered groups, with your group driven by your fare, your loyalty status, and where your seat is on the aircraft. In practice it now looks much more like the other carriers on this page than it did for the previous fifty years.

They all run the same basic shape: status and cabin first, cheapest fare last.Whether it's called a "group" (American, United, Southwest) or a "zone" (Delta, Frontier, Allegiant), the logic is identical: premium cabin and top-tier elites board first, general economy boards in the middle, and the cheapest fare (basic economy, where it exists) boards dead last, after even standard economy. United consolidated its system to 5 numbered groups in 2023; American and Delta each still run more granular systems (roughly 9 groups and 8 zones respectively) that separate elite tiers more finely. Alaska and JetBlue use a mix of letters and numbers tied to their own status programs (MVP tiers at Alaska, Mosaic at JetBlue) ahead of general boarding.

Boarding early doesn't fix a basic-economy carry-on ban. A higher group or zone gets you on the plane sooner and improves your odds of overhead bin space, but it doesn't override what your fare allows in the cabin to begin with. United's Basic Economy passengers board in the last group and still can't bring a full carry-on at all, see our basic economy carry-on rules guide for which carriers restrict what, independent of boarding order.

Discount carriers sell priority boarding as an add-on. Frontier and Allegiant (the two carriers that also price bags dynamically, see our guide to their bag-fee pricing) both let you buy your way into an earlier zone at checkout or check-in, on top of whatever your fare and status would otherwise get you. That's on top of, not instead of, the underlying zone system every other passenger boards under.