JetBlue shares tumble roughly 20% after disappointing outlook

1. JetBlue's financial outlook disappointed investors, causing share price decline. 2. Cost increase forecasted up to 10% this quarter, excluding fuel costs. 3. Revenue estimates could be 0.5% lower to 3.5% higher year-over-year. 4. Competitors Delta and United expect higher revenue growth and pricing power. 5. JetBlue is restructuring by cutting unprofitable routes and raising ticket prices.