Frontier Airlines expects revenue boost after Spirit Airlines collapses, reducing competition.

Frontier Airlines anticipates a 3% to 5% increase in revenue per available seat mile following the sudden collapse of Spirit Airlines, which removed significant competition overnight. Spirit had a 35% seat overlap with Frontier, and its exit is expected to lift Frontier's unit revenue by over 20% in the second quarter due to strong demand and less competition. Frontier was previously set to merge with Spirit before JetBlue's blocked acquisition attempt. The airline's shares rose over 6% after reporting these optimistic forecasts.