Spirit Airlines ceased operations on Saturday following a prolonged period of financial instability, resulting in the loss of approximately 17,000 jobs and disrupting travel plans for tens of thousands of passengers. The airline’s shutdown highlights its waning influence on the U.S. aviation industry, where low-cost carriers once played a significant role in shaping fare structures.

At its peak, Spirit was a formidable presence in the domestic airline market, but recent years have seen a marked decline. By May 2024, the carrier operated just 3.4% of all domestic flights, according to aviation data firm Cirium. Its scheduled service for May 2025 was projected to decline further to only 1.1%, underscoring its shrinking footprint. The airline had filed for bankruptcy twice within the past two years and had been forced to park and sell off about half of its fleet before ultimately shutting down.

Despite efforts from the previous administration to rescue Spirit through negotiations between the government and creditors, no agreement was reached. Following the closure, other airlines have temporarily offered discounted fares to accommodate displaced Spirit passengers.

Industry experts suggest Spirit’s absence may create an environment conducive to fare increases, particularly in markets where the carrier’s presence helped suppress prices—a trend known in the industry as the “Spirit effect.” Robert Mann, a former airline executive and consultant, explained that Spirit’s focus on the low-fare segment “established the market price” in many areas, and its exit could enable competitors to raise prices more easily.

However, some analysts contend that fares were poised to rise regardless of Spirit’s fate. Factors such as elevated fuel costs—partly driven by geopolitical tensions like the conflict involving Iran—have compelled airlines to increase prices since March, with further hikes anticipated. William Swelbar, an aviation consultant and economist, noted in correspondence that industry-wide fare increases are “necessary” to prevent further financial failures and consolidations among U.S. carriers.

Frontier Airlines, one of Spirit’s closest competitors in the low-cost segment, is expected to benefit from the void but faces similar operational and financial pressures.

Although Spirit’s shutdown removes a notable player, the broader impact on airfares and the U.S. aviation industry remains uncertain. Analysts agree that while the immediate disruption is significant, the long-term consequences will depend on how remaining airlines adjust their networks and pricing strategies amidst ongoing economic and geopolitical challenges.