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US major indices closed mixed in a highly volatile session: the Dow rose 0.17% while the S&P fell 0.26% and the Nasdaq dropped 0.97%, with intraday ranges of over 1,000 points on the Dow and 1,279 points on the Nasdaq. Chip and AI-linked stocks led losses — dragged by Broadcom's prior forecast miss and a near-7% drop in the Philadelphia Semiconductor index — while airlines rallied 3–7% on lower oil prices tied to potential Iran-US de-escalation. A stronger-than-expected May jobs report (172K vs. consensus) revived rate-hike fears ahead of Tuesday's CPI print, pressuring high-valuation growth stocks.

U.S. airlines spent 56.4% more on jet fuel in March than in February, according to U.S. government data, coinciding with the onset of the Iran war. The sharp month-over-month increase in fuel costs represents a significant headwind to airline operating margins. No individual carrier figures were broken out in the reported data.

Spirit Airlines has collapsed, and rivals are expected to benefit from reduced competition by gaining pricing power and capturing Spirit's former customer base. The article argues that the removal of a major ultra-low-cost carrier from the market will contribute to higher airfares industry-wide. Carriers positioned to absorb Spirit's routes and passengers stand to gain market share.

Spirit Airlines has collapsed, and analysts expect rival carriers to gain pricing power as they compete to absorb Spirit's former customer base. The reduction in ultra-low-cost capacity in the market is anticipated to push airfares higher. The article highlights the competitive and pricing implications for the broader airline industry following Spirit's demise.

U.S. airline executives report that travelers continue booking flights despite significant fare increases implemented to offset rising fuel costs. The trend suggests demand remains resilient in the face of higher ticket prices. No specific carriers or financial figures were cited in the article.