JetBlue (NASDAQ:JBLU) stock is falling hard on Monday after the airline company announced a $400 million senior secured notes offering.JetBlue is selling $400 million worth of senior secured notes due in 2029. Additionally, initial investors in this offering will have a 13-day option to acquire another $60 million worth of senior secured notes.JetBlue says that it will use some of the funds from this offer to repurchase its 0.50% senior convertible notes due 2026. The rest will go toward general corporate p ...