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Editor’s note: This is a static version of the interactive story found at this link.
Part 1: A struggling regional carrier
The legacy network
Air Wisconsin Airlines has not been spared by the nationwide decline of regional air service. The 60-year-old carrier laid off hundreds of employees in Appleton and Milwaukee last year after terminating a contract to provide aircraft, crews and services to American Airlines in January 2025. The airline’s planned pivot to charter service and federally subsidized connections to underserved airports didn’t pan out, prompting another round of layoffs by the spring.
But the company’s troubles didn’t entirely ground its fleet. Flight tracking data indicate that Air Wisconsin continued to provide regional air service through the end of 2025, primarily connecting its Wisconsin hubs to mid-sized Midwestern airports as it had for decades.
The sale
In January, Harbor Diversified Inc., the Appleton-based parent company of Air Wisconsin, sold the company’s operations and 13 of its jets to CSI Aviation, a New Mexico-based air charter company and longtime federal contractor owned by former New Mexico Republican Party chair Allen Weh.
Air Wisconsin sent recall notices to the company’s furloughed flight attendants after the sale to CSI Aviation, and the Association of Flight Attendants — the union representing the furloughed workers — negotiated an immediate raise for returning members. In a January press release announcing the recall notices, the union noted that only a third of the furloughed flight attendants opted to return…