Indigo Partners

Indigo Partners, LLC is an American private equity firm headquartered in Phoenix, Arizona, and founded by aviation investor Bill Franke. The firm is associated with a distinctive investment model: taking significant or controlling interests in low-cost airlines and helping them develop standardized, high-utilization operating models aimed at price-sensitive travelers. Rather than presenting itself as a conventional consumer airline brand, Indigo Partners operates primarily as an investment and strategic ownership platform whose portfolio companies retain their own names, management structures, regulatory certificates, and market identities. The firm’s best-known airline interests include controlling stakes in Frontier Airlines in the United States and JetSMART in Chile and other parts of South America. It has also held stakes in Volaris of Mexico and Wizz Air, the Hungarian-founded European low-cost carrier. These businesses serve different geographic markets, but share an emphasis on low base fares, ancillary revenue, relatively young Airbus fleets, high aircraft utilization, and disciplined cost control. Through its portfolio, Indigo Partners has therefore become closely associated with the expansion of ultra-low-cost and low-cost airline models across North America, Latin America, and Europe. A major expression of the firm’s strategy came at the 2017 Dubai Air Show, when Indigo Partners signed a memorandum of understanding covering 430 Airbus A320neo-family aircraft for its airline investments. The allocation described at the time was 146 aircraft for Wizz Air, 134 for Frontier Airlines, 80 for Volaris, and 70 for JetSMART. At Airbus list prices, the transaction was valued at approximately $49.5 billion, although list-price figures do not necessarily represent the actual commercial price paid. The proposed fleet expansion illustrated Indigo’s preference for common aircraft families and large-scale purchasing as tools for reducing operating complexity and supporting network growth. Indigo Partners has also pursued opportunities outside its established portfolio. In late 2018, it reached a preliminary agreement to acquire Icelandic low-cost carrier WOW air after Icelandair Group abandoned its own proposed takeover. Indigo withdrew from the transaction in March 2019, and WOW air subsequently ceased operations. The episode demonstrated both the firm’s interest in distressed or strategically attractive low-cost carriers and the risks associated with airline turnarounds in volatile markets. In November 2021, Indigo Partners announced another large Airbus order, for 255 A321 aircraft. The order reinforced the platform’s continuing commitment to narrow-body aircraft and to the growth of its airline investments. In 2022, Indigo-backed Frontier Airlines attempted to combine with Spirit Airlines. Frontier proposed a transaction valued at more than $2.6 billion in a mix of cash and stock, but the planned merger did not proceed after JetBlue Airways made a higher all-cash offer, reported at $3.7 billion. Spirit ultimately agreed to JetBlue’s proposal, although that transaction later failed to close after regulatory opposition. Indigo Partners also had a partnership with Enerjet connected with the launch of Lynx Air, a Canadian ultra-low-cost airline. Lynx Air later became defunct. Overall, Indigo Partners is best understood as a specialized aviation investment firm rather than a single airline operator. Its influence comes from assembling and scaling low-cost carriers, securing aircraft capacity, and applying common commercial and operating principles across multiple national markets.

Indigo Partners was founded by Bill Franke as a private equity platform specializing in aviation. Its central strategy has been to invest in low-cost airlines and apply repeatable operating principles across different regulatory and geographic markets. The firm’s portfolio has included carriers in the United States, Europe, Latin America, and, through a partnership connected with Lynx Air, Canada. The platform became particularly associated with Frontier Airlines, the American ultra-low-cost carrier, and JetSMART, a Chilean-founded low-cost airline serving South American markets. Indigo has also held interests in Volaris of Mexico and Wizz Air, the Hungarian-founded European carrier. Although these airlines operate independently under their own brands, Indigo’s portfolio structure links them through common ownership interests, aircraft procurement strategy, and an emphasis on low fares supported by ancillary revenues. The firm’s most prominent fleet initiative was announced at the November 2017 Dubai Air Show. Indigo Partners signed a memorandum of understanding for 430 Airbus A320neo-family aircraft. The planned allocation was 146 aircraft to Wizz Air, 134 to Frontier Airlines, 80 to Volaris, and 70 to JetSMART. Airbus list-price estimates put the value at about $49.5 billion, but the figure was a list-price reference rather than a disclosed final transaction value. The order demonstrated the scale of Indigo’s approach and its reliance on a common narrow-body aircraft family across portfolio airlines. Indigo also explored acquisitions beyond its core holdings. In November 2018, it reached a preliminary agreement to purchase WOW air, an Icelandic low-cost airline, after Icelandair Group dropped its own takeover plan. Indigo withdrew from the proposed acquisition on March 22, 2019. WOW air subsequently stopped operating, making the transaction one of the firm’s unsuccessful airline rescue or expansion initiatives. In 2021, Indigo Partners ordered 255 Airbus A321 aircraft. The order continued the firm’s focus on larger narrow-body aircraft and on expanding the capacity of its affiliated carriers. Indigo’s airline investments also included involvement with Enerjet in connection with the launch of Lynx Air, a Canadian ultra-low-cost carrier that later became defunct. In 2022, Frontier Airlines sought to merge with Spirit Airlines. Frontier’s proposal was reported as being worth more than $2.6 billion in cash and stock. JetBlue Airways subsequently offered approximately $3.7 billion in cash, and Spirit selected JetBlue’s proposal instead. The proposed Frontier–Spirit combination therefore did not proceed. The episode highlighted Indigo’s interest in airline consolidation as well as the competitive and regulatory complexity of mergers among major low-cost carriers. Indigo Partners remains principally an investment and ownership organization rather than a passenger-facing airline. Its historical significance lies in helping establish and expand low-cost airline platforms, coordinating large aircraft commitments, and supporting carriers that compete through simplified operations and low headline fares.

1. 2022Proposed Frontier–Spirit combination

   Frontier Airlines pursued a merger with Spirit Airlines, but JetBlue’s competing offer prevailed and the Frontier proposal failed.

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2. 2021255-aircraft Airbus A321 order

   Indigo Partners ordered 255 Airbus A321 aircraft for its airline investment platform.

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3. 2019WOW air offer withdrawn

   Indigo Partners withdrew from the proposed WOW air acquisition.

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4. 2018Preliminary WOW air acquisition agreement

   The firm reached a preliminary agreement to acquire Icelandic low-cost carrier WOW air.

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5. 2017430-aircraft Airbus memorandum

   Indigo Partners signed a memorandum covering 430 Airbus A320neo-family aircraft for Wizz Air, Frontier Airlines, Volaris, and JetSMART.

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A specialist aviation investment platform focused on building, scaling, and supporting low-cost airlines across multiple regions.

• Airline investment platformPrivate equity and aviation investment

  Indigo Partners’ principal offering is its ownership and investment platform for low-cost airlines. The firm provides capital, supports growth and fleet planning, and participates in strategic decisions involving its airline holdings. It does not sell a standardized consumer product; instead, its business is expressed through the airlines and aviation assets in which it invests.

• Airbus A320neo and A321 fleet programsFleet procurement and airline expansion2017

  Large Airbus narrow-body aircraft commitments have been a central strategic tool for Indigo Partners. Common aircraft types can support fleet efficiency, pilot and maintenance standardization, route expansion, and high utilization across affiliated low-cost carriers. Major commitments were announced in 2017 and 2021.

• 2022Frontier’s proposed Spirit Airlines mergerM&A

  Frontier and Spirit were both major United States low-cost carriers, and a combination would have created a larger ultra-low-cost airline.

  What changed. Frontier, backed by Indigo Partners, proposed a cash-and-stock merger valued at more than $2.6 billion.

  Aftermath. JetBlue made a higher all-cash offer reported at $3.7 billion, and the Frontier proposal did not proceed.

  Reported proposal value. More than $2.6 billion (2022)

  • JetBlue Airways — JetBlue responded with a reported $3.7 billion all-cash offer for Spirit Airlines.
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• 2021Order for 255 Airbus A321 aircraftProduct launch

  The firm continued to expand the narrow-body fleets of its airline investments.

  What changed. Indigo Partners placed an order for 255 Airbus A321 aircraft.

  Aftermath. The order reinforced the platform’s long-term commitment to low-cost airline growth and Airbus fleet commonality.

  Source
• 2018Proposed acquisition of WOW airM&A

  WOW air was seeking a strategic solution after Icelandair Group abandoned its proposed takeover.

  What changed. Indigo Partners reached a preliminary agreement to acquire the Icelandic low-cost carrier.

  Aftermath. Indigo withdrew its offer in March 2019, and WOW air later ceased operations.

  Source
• 2017Commitment to 430 Airbus A320neo-family aircraftProduct launch

  Indigo Partners sought to expand the fleets of four affiliated low-cost airlines while preserving a common narrow-body aircraft strategy.

  What changed. The firm signed a memorandum of understanding for 430 aircraft, allocated among Wizz Air, Frontier Airlines, Volaris, and JetSMART.

  Aftermath. The commitment became a defining example of Indigo’s portfolio-wide fleet and growth strategy.

  Airbus list-price value. $49.5 billion list price (November 2017)

  Source

• 2022Frontier and Spirit pursue a proposed merger

  Frontier Airlines, controlled by Indigo Partners, attempted to merge with Spirit Airlines, but the transaction was overtaken by JetBlue’s higher all-cash proposal.

  M&A
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• 2021Indigo Partners orders 255 Airbus A321 aircraft

  Indigo Partners placed an order for 255 Airbus A321 aircraft, extending its fleet-expansion strategy for affiliated low-cost airlines.

  Product launchProduct generation
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• 2019Indigo Partners withdraws from WOW air acquisition

  Indigo Partners withdrew its offer for WOW air in March 2019. WOW air later ceased operations.

  M&ABankruptcy
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• 2018Indigo Partners reaches preliminary agreement to acquire WOW air

  Indigo Partners reached a preliminary agreement to buy Icelandic low-cost carrier WOW air after Icelandair Group abandoned its proposed takeover.

  M&A
  Source
• 2017Indigo Partners signs memorandum for 430 Airbus aircraft

  At the Dubai Air Show, Indigo Partners agreed in principle to acquire 430 Airbus A320neo-family aircraft for allocation among Wizz Air, Frontier Airlines, Volaris, and JetSMART.

  Product launch
  Source

1. Indigo Partners