Spirit Airlines in Talks With Castlelake Amid Chapter 11

Spirit Airlines is in talks with alternative investment firm Castlelake over a potential takeover as the US low-cost carrier seeks a path forward from Chapter 11 bankruptcy, according to people familiar with the matter. The discussions come as Spirit continues negotiations with creditors and explores strategic options following its bankruptcy filing in August 2025—its second Chapter 11 filing in a single year.

Spirit confirmed in mid-December that it had amended an agreement with creditors to secure an additional US$50 million in immediate funding. The airline noted that further financing would depend on progress toward “a standalone plan of reorganization or a strategic transaction.” In a Dec. 15 filing, the company stated, “Spirit is currently in active negotiations on each of these possibilities.”

A Spirit spokesperson declined to comment on talks with Castlelake, saying, “We do not comment on market rumors and speculation.” Castlelake did not respond to requests for comment. It remains unclear whether Spirit’s bondholders and Castlelake will reach an agreement or what form a transaction might take.

Minneapolis-based Castlelake has been active in aviation finance for years. In August, the firm launched a new aviation lending platform, Merit AirFinance, backed by US$1.8 billion in deployable capital. Any lead role by Castlelake would expand the firm’s footprint in airline financing and restructuring.

Spirit’s search for options follows years of financial and operational strain. After its previous turnaround plan failed, the airline filed for Chapter 11 in August 2025, reducing its flight schedule, downsizing its fleet, and cutting jobs to lower costs. Labor unions agreed last year to pay reductions for pilots and flight attendants, totaling US$100 million. The Air Line Pilots Association urged bondholders in a Jan. 13 open letter to support the restructuring to avoid liquidation, warning, “Liquidation would be devastating for employees, communities, and creditors alike.”

Spirit has also explored consolidation as a survival strategy. Frontier Airlines held merger talks with Spirit in recent months, but no deal materialized. The carriers previously reached a merger agreement four years ago, which was abandoned after JetBlue Airways made a competing all-cash offer. A federal judge later blocked that transaction, ruling it would be anticompetitive, leaving Spirit and other smaller carriers to compete independently in a market dominated by larger airlines.

That transaction was later blocked by a federal judge, who ruled two years ago that the JetBlue-Spirit deal would be anticompetitive. The decision left Spirit and other smaller carriers competing independently in a market dominated by larger airlines.

The airline’s difficulties intensified after a recall of Pratt & Whitney engines grounded dozens of Airbus aircraft beginning in 2023, reducing capacity and raising costs. Shifts in consumer behavior post-pandemic, an oversupply of domestic flights, and rising labor and operational expenses further pressured margins, particularly for carriers without premium cabins or large loyalty programs.

Before the pandemic, Spirit consistently reported profitability and strong margins relative to peers. The airline has since adjusted its commercial strategy to attract higher-spending customers, introducing roomier seating, bundled fares that include baggage and seat assignments, and ticket flexibility. These measures aim to improve competitiveness against rivals whose profits have been bolstered by premium demand.

As Spirit continues negotiations with Castlelake and creditors, the outcome could shape the airline’s future structure, ownership, and route network. The talks underscore the financial pressures facing smaller US carriers amid rising costs, regulatory constraints, and industry consolidation. For investors and industry stakeholders, Spirit’s next steps may serve as a case study in restructuring options for distressed carriers.

US airlines are increasingly turning to premium seating to drive revenue growth. American Airlines said the strategy is part of a “customer reimagination” plan focused on premium cabins, improved food and beverage service, faster Wi-Fi, and expanded loyalty benefits.

However, IATA Director General Willie Walsh rejected claims that the low-cost carrier model is in decline, countering recent comments by United Airlines CEO Scott Kirby. Speaking at the World Aviation Festival in Lisbon in 2025, Walsh said the LCC model is “alive and well,” noting continued growth in Europe, Asia, and other regions, and emphasizing that US conditions are not representative of global trends.