JetBlue Airways (JBLU) shares ended the last trading session 14.2% higher at $7.30. The jump came on an impressive volume with a higher-than-average number of shares changing hands in the session. This compares to the stock's 18.6% gain over the past four weeks.This jump in stock price came after news that Spirit Airlines (SAVE) , a JBLU rival in the low-cost airline space, is considering bankruptcy. Spirit has faced losses and declining revenue due to fierce competition and failed attempts to merge with Fr ...