FlightRecord

Airports With the Most (and Least) Airline Competition

By Sharon Ben-Moshe ·

Austin-Bergstrom has the most airline choice of any major U.S. airport — 15 airlines competing on its routes. At the other extreme, six airports, from Aspen to three small Florida fields, are served by exactly one carrier. Having no competition doesn't reliably predict worse service: half of those six monopoly airports beat the 78.2% national on-time average.

  • Austin-Bergstrom International (AUS) has the most airline competition of any major U.S. airport — 15 different airlines, ahead of Minneapolis-St. Paul, Nashville, Pittsburgh, Kansas City, and Charleston (14 each).
  • Six U.S. airports with more than 5,000 annual departures are served by exactly one airline: Phoenix-Mesa Gateway, St. Petersburg-Clearwater, Orlando Sanford, Punta Gorda, Aspen, and St. George, Utah.
  • Four of those six single-airline airports are Allegiant Air monopolies serving leisure destinations in Florida and Arizona; the other two — Aspen and St. George — are served exclusively by SkyWest Airlines.
  • On-time performance at the six monopoly airports ranges from 69.6% (Aspen) to 87.7% (St. George) — the single-airline airport in St. George actually out-performs Austin-Bergstrom's 77.2%, despite Austin having 15 airlines to choose from.
  • Based on FlightRecord's dataset of 14.1 million U.S. DOT flight records, June 2024-May 2026; national on-time average 78.2%.

Which U.S. airports have the most airline competition?

Measured by how many different airlines fly out of each airport, competition doesn't track airport size the way you'd expect. Here are the airports with the most airline choice, among those with more than 1,000 annual departures:

Austin beats Chicago O'Hare and Atlanta on airline count despite those two hubs handling roughly four times as many flights — O'Hare and Atlanta are each built around one or two dominant network carriers, while mid-size airports like Austin, Nashville, and Charleston have become magnets for budget and ultra-low-cost carriers layering on top of a legacy anchor. Raw airport size predicts traffic volume, not how many airlines are willing to compete for it.

Which U.S. airports have the least — or no — airline competition?

At the other end of the spectrum, a handful of airports with meaningful passenger volume — more than 5,000 departures over the two-year dataset, ruling out tiny airstrips — are served by exactly one airline:

The single-airline pattern splits cleanly into two business models. Four of the six — the Florida and Arizona airports — are Allegiant monopolies: Allegiant specializes in flying leisure travelers directly to smaller, secondary airports near tourist destinations, deliberately avoiding head-to-head competition with legacy carriers at the bigger airports nearby. The other two, Aspen and St. George, are served entirely by SkyWest Airlines, a regional carrier that connects smaller or geographically difficult markets to major-airline hub networks under those airlines' regional brands.

Does having no airline choice mean worse reliability?

Not reliably. St. George, Utah — with exactly one airline — posts an 87.7% on-time rate, the best of any airport in this comparison and well ahead of Austin-Bergstrom's 77.2% despite Austin having 15 airlines to choose from. Phoenix-Mesa Gateway and Punta Gorda, also single-airline Allegiant airports, both beat or roughly match the 78.2% national average. Aspen is the outlier, at 69.6% on-time — but that's a geography problem, not a competition problem: FlightRecord's separate look at which flight routes get diverted most often found that Aspen's mountain terrain drives four of the five most-diverted routes in the entire country, regardless of which airline is flying. Aspen has one airline because its runway and approach limit who can safely fly there — not because a second airline was kept out of a fair fight.

This is a different question from FlightRecord's earlier look at monopoly routes, which examined specific origin-destination pairs with only one airline. An airport can have plenty of overall airline choice while still having individual monopoly routes to certain destinations — airport-level competition and route-level competition are related but not the same measurement.

Why do some airports end up with only one airline?

Mostly because the market doesn't support more. Small leisure destinations and secondary airports typically don't generate enough year-round demand to profitably support two competing carriers, so a single low-cost or regional operator captures the whole market instead of splitting it. Airports with physical constraints — a short runway, a demanding mountain approach, limited gate space — narrow the field further to whichever carrier operates the aircraft and has the pilot training suited to that airport. Neither situation is usually a matter of a carrier being deliberately blocked from entering; it's a function of demand and infrastructure.

How did FlightRecord measure airline competition?

For the most-competition ranking, FlightRecord counted distinct airlines serving each airport with more than 1,000 departures in the 24-month dataset. For the least-competition ranking, the threshold was raised to 5,000 departures specifically to exclude tiny regional airstrips that technically have one carrier but barely operate — the airports on that list are real, meaningfully used airports, just ones a single airline has claimed.

Airline counts and on-time rates reflect two years of historical DOT data and can change as airlines add or drop routes — an airport with one airline today isn't guaranteed to stay that way, and vice versa.

Frequently Asked Questions

What counts as "airline competition" at an airport in this analysis?

FlightRecord counts the number of distinct airlines with scheduled departures from each airport over the 24-month dataset. An airport with 15 airlines has 15 separate carriers selling tickets out of it; an airport with 1 airline has exactly one carrier controlling all scheduled service, regardless of how many flights or destinations that single carrier offers.

Which airport has the most airline choice in the U.S.?

Austin-Bergstrom International Airport (AUS) has the most, with 15 different airlines flying scheduled routes out of it — more than larger hubs like Chicago O'Hare or Atlanta, which each have 13. Minneapolis-St. Paul, Nashville, Pittsburgh, Kansas City, and Charleston each follow closely with 14 airlines apiece.

Which U.S. airports are served by only one airline?

Among airports with meaningful passenger volume, six are served by exactly one airline: Phoenix-Mesa Gateway and Punta Gorda, St. Petersburg-Clearwater, and Orlando Sanford (all Allegiant Air), plus Aspen-Pitkin County and St. George Regional (both SkyWest Airlines). Smaller airstrips below 5,000 departures were excluded from this list.

Does flying out of a monopoly airport mean worse on-time performance?

Not consistently. On-time rates at the six single-airline airports range from 69.6% to 87.7%, spanning both below and above the 78.2% national average. St. George, with only one airline, actually posts a better on-time rate than Austin-Bergstrom, which has 15. Reliability at these airports tracks the airport's own operating conditions more than the number of competing airlines.

Is airport-level airline competition the same as route-level competition?

No. An airport can have many airlines overall while individual routes from that airport are still flown by only one carrier — those are called monopoly routes. Airport-level competition measures how many airlines operate somewhere out of the airport at all; route-level competition measures choice on one specific origin-destination pair.

Written by Sharon Ben-Moshe, founder of FlightRecord. All figures are computed from US DOT Bureau of Transportation Statistics on-time data — see our methodology. Past performance describes history, not any guarantee about a future flight.

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