What Airline Alliance means
Alliances grew in the late 1990s as airlines looked for global reach without cross-border mergers, which ownership rules often restrict. Star Alliance was founded on 14 May 1997, linking five airlines, and reports 26 member airlines (as of 2026). oneworld took effect on 1 February 1999 with American Airlines, British Airways, Canadian Airlines, Cathay Pacific and Qantas. SkyTeam was founded in June 2000 by Aeroméxico, Air France, Delta Air Lines and Korean Air.
An alliance is a framework rather than a single agreement. Members usually interline with each other, so one ticket can cover several members, and many also codeshare. Alliances add shared benefits such as reciprocal frequent flyer earning and redemption, lounge access for top-tier members and co-location at airports.
Some members go further with joint ventures. The US Department of Transportation explains that alliance partners can apply for antitrust immunity, which allows them to coordinate fares, services and capacity in covered markets as if they were a single carrier, subject to conditions.
Membership changes over time, and not every major airline belongs to one. Some large carriers are not members of any global alliance and rely on bilateral partnerships instead, so agents should check each airline's current partners rather than assume alliance benefits apply.
How Airline Alliance works
An alliance layers commercial agreements on top of the airlines' own networks and systems.
- Airline joinsA carrier is invited, meets the alliance's operating and service requirements and connects its systems to members.
- Interline and codeshare linksMembers put in place ticketing, baggage and often codeshare agreements so their flights can be sold together.
- Loyalty is sharedFrequent flyers can earn and redeem miles across members and receive tier benefits on partner flights.
- Products are soldAgencies and airlines sell multi-carrier itineraries and alliance products such as round-the-world fares.
- Deeper venturesSelected partners may form joint ventures with shared revenue and, where approved, antitrust immunity.
Airline Alliance in practice
Founding members: oneworld launched on 1 February 1999 with American Airlines, British Airways, Canadian Airlines, Cathay Pacific Airways and Qantas. SkyTeam's founders in June 2000 were Aeroméxico, Air France, Delta Air Lines and Korean Air.
Alliance itinerary (illustrative): a traveller flies Kuala Lumpur to Doha and on to London with two members of the same alliance. The agency issues one ticket, bags are checked through, and the traveller's elite status on one member gives lounge access on the other.
Suspensions: alliances can suspend members. oneworld notes that S7 Airlines' membership was suspended from 19 April 2022.
Who uses it
Advantages and limitations
Advantages
- Travellers reach far more destinations on one ticket, with through-checked bags and shared loyalty benefits.
- Airlines gain global reach and partner traffic without mergers that ownership rules may block.
- Agencies can sell coordinated schedules and alliance products such as round-the-world fares.
Limitations
- Alliance membership does not guarantee identical service, fare rules or baggage policies across members.
- Members can leave, join or be suspended, which changes partnerships and loyalty benefits.
- Joint ventures with antitrust immunity can reduce competition on some routes, so regulators attach conditions.
Frequently asked questions about Airline Alliance
What are the three major airline alliances?
The three global alliances are Star Alliance, founded in May 1997, oneworld, which took effect on 1 February 1999, and SkyTeam, founded in June 2000. Each brings together airlines from several regions with shared loyalty benefits, lounge access and connected networks. Membership lists change, so check each alliance's website for current members.
Which is the largest airline alliance?
Measured by number of member airlines, Star Alliance is the largest, reporting 26 members as of 2026. Size can also be measured by passengers, destinations or revenue, and the rankings can differ depending on the measure and the year used, so it is best to compare figures from the same source and period.
Is a joint venture the same as an alliance?
No. An alliance is a broad network of partner airlines. A joint venture is a deeper agreement between a few airlines, often within an alliance, in which they share revenue on certain routes. In the US, partners with antitrust immunity can coordinate fares, schedules and capacity as if they were one airline.
Can I earn miles on any alliance airline?
Generally, members of the same alliance let you earn and redeem miles across each other's flights, but the rate depends on the fare booked and the operating and marketing carrier. Some fares earn reduced or no miles. Always check the loyalty programme's partner earning chart for the specific booking class.
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