Airline Groups
IAG: The Merger That Made British Airways a Holding Company
Two liveries, one owner: Iberia (left) and British Airways (right) — both flying under IAG since 2011. Photo: scott wright, Barcex — derivative by Altair78, CC BY-SA 3.0
British Airways hasn’t been an independent company since 21 January 2011. It’s a wholly owned brand inside International Airlines Group (IAG), a holding company formed by merging BA with Spain’s Iberia. That’s more than a technicality. IAG is a Spanish-registered company, listed in both London and Madrid, and it now owns five separate airline brands.
So why does one company own BA, Iberia, Vueling and Aer Lingus?
Because no two of them cover the same ground. That’s the real answer, and it’s worth being specific rather than waving at “synergies”. British Airways holds Heathrow’s premium slots for North Atlantic and Asian long-haul flights, the most valuable airport real estate in Europe. Iberia holds Madrid-Barajas and, through it, Latin American routes BA never had reason to build, resting on long-standing ties between Spain and Latin America. Aer Lingus has something neither of the others has at all: a US Customs and Border Protection pre-clearance facility in Dublin. Passengers bound for the US clear American immigration before they even board, a rare asset that makes Dublin a transatlantic gateway in its own right. Vueling and LEVEL exist because none of the first three can fly budget short-haul or budget long-haul profitably without undercutting their own premium fares. A full-service airline undercutting itself on the same route does more damage than owning a separate low-cost brand that competes for the price-sensitive passenger instead.
Members
The five IAG brands
British Airways
London Heathrow · North Atlantic & Asia
Founding merger, 2011
Iberia
Madrid-Barajas · Latin America
Founding merger, 2011
Vueling
Barcelona · Short-haul Europe & Med
Acquired 2013
Aer Lingus
Dublin · Transatlantic (US pre-clearance)
Acquired 2015, €1.36bn
LEVEL
Barcelona · Long-haul low-cost
Launched from within, 2017
Why a merger, not an acquisition
British Airways and Iberia had been commercial partners for years before they merged. They shared flights through codeshares, both belonged to Oneworld and were gradually bringing their frequent-flyer benefits together. Their boards signed a preliminary merger agreement in November 2009 and completed the deal on 21 January 2011. Setting it up as a merger of equals in a new holding company, rather than BA simply buying Iberia, mattered politically. Iberia’s Spanish shareholders and unions would never have accepted becoming a subsidiary of a British company. They did accept becoming co-owners of a new, nominally neutral holding company, based in Spain for tax and listing reasons.
The arc
How IAG was actually assembled
- 2009The bet
BA and Iberia sign a preliminary merger agreement
Years of codesharing and shared Oneworld membership precede this — the merger formalises an already-close relationship.
- 2011The bet
IAG is formed
21 January 2011 — BA and Iberia become brands under a new, Spanish-registered holding company. Neither repaints, neither reports to the other’s government.
- 2012Proof
BMI acquired and absorbed into BA
Agreed in December 2011 and completed in April 2012, a pure slots play that pushed IAG’s Heathrow slot share to roughly 54%. No new brand; BMI disappears entirely.
- 2013Reset
Vueling acquired
A Barcelona low-cost carrier bought outright to compete with Ryanair and easyJet on short-haul European routes IAG’s full-service brands can’t price into.
- 2015Proof
Aer Lingus joins for €1.36 billion
A long, politically sensitive approval process in Ireland precedes it. The prize: Dublin’s US pre-clearance facility, a genuinely rare transatlantic gateway asset.
- 2017Reset
LEVEL launches
Built from within the group rather than acquired — IAG’s own answer to Norwegian’s transatlantic low-cost push, flying long-haul out of Barcelona (and, until 2020, Paris).
The BMI acquisition — the exception that proves the rule
BMI is the one deal here that wasn’t about adding a brand. It was folded straight into British Airways and vanished as a separate airline within months. Why treat it differently? BMI didn’t bring a region BA lacked; it brought Heathrow slots BA wanted for routes it already flew. When the prize is slots rather than new markets, there’s no reason to keep a separate brand alive. That appears to be the test IAG applies every time it looks at a target.
Where this leaves the group today
There are five customer-facing brands: full-service long-haul (BA, Iberia), full-service with a strong regional identity (Aer Lingus), low-cost short-haul (Vueling) and low-cost long-haul (LEVEL). That spread lets the group compete at almost every price point in transatlantic and European travel, without any brand having to stretch beyond its own position. Ask “why does IAG own this airline?” about any of the five, and the answer is always a specific hub, region or price point the other four don’t reach.
What the numbers actually show, 2025
IAG had a record 2025. Group revenue rose 3.5% to €33.2 billion, operating profit before exceptional items rose 13.1% to €5.0 billion, and the operating margin reached 15.1%, a strong figure for an airline group. What stands out is where the growth came from: Iberia and British Airways drove almost all of it. Iberia’s operating profit before exceptional items grew by €286 million, to a 16.2% margin. British Airways’ grew by £182 million, to a 15.2% margin. So nearly fifteen years after the merger, the two founding partners, not the later purchases, are still the group’s main profit engines. Net profit reached €3.3 billion, up from €2.7 billion the year before.
That concentration sits awkwardly with the group’s own multi-brand pitch. Vueling, Aer Lingus and LEVEL exist to cover segments BA and Iberia can’t serve profitably, yet so far the original two-airline core still does almost all the work on profit. The more interesting question behind the headline number is whether that balance shifts as Aer Lingus and Vueling mature inside the group, or stays weighted towards Heathrow and Madrid for good.
Sources & Further Reading
Common Questions
Frequently Asked Questions
Who owns British Airways?
International Airlines Group (IAG). BA became a brand inside IAG on 21 January 2011, when it merged with Spain’s Iberia under a new holding company registered in Spain and listed in London and Madrid.
Which airlines does IAG own?
Five brands: British Airways, Iberia, Vueling, Aer Lingus and the long-haul low-cost brand LEVEL. BMI was also bought, but it was folded into British Airways rather than kept as a brand.
Is IAG a British or a Spanish company?
It’s registered in Spain and listed on both the London and Madrid stock exchanges. The merger was set up as a merger of equals in a new holding company, partly so Iberia’s shareholders and unions wouldn’t see it as a British takeover.
Which IAG airline makes the most money?
The two founding partners. In 2025 Iberia made a 16.2% operating margin and British Airways 15.2%, and together they drove almost all of the group’s profit growth.
Why did IAG buy Aer Lingus?
For Dublin. Aer Lingus passengers bound for the United States clear US immigration in Dublin before they board, a rare advantage that makes Dublin a transatlantic gateway in its own right.
Last reviewed: October 2026. Facts that change, such as fleets, airspace and airline ownership, are re-checked on a schedule. Spotted an error? Email contact@skyplus.news and we’ll fix it. See how we check facts.