Airlines quickly expand routes after Spirit Airlines collapses, pushing fares higher amid fuel cost surge.

Spirit Airlines abruptly ceased operations due to mounting financial troubles worsened by rising jet fuel prices linked to the Iran war. Rival airlines swiftly moved to fill the void by adding new routes and competing for Spirit's airport gates and customer base, which may lead to higher airfares. Major carriers like JetBlue, Breeze Airways, United, and Southwest have launched new flights and capped fares for stranded Spirit passengers. The collapse highlights the challenges budget airlines face amid fuel price spikes and could reshape the competitive landscape in U.S. domestic air travel.