WASHINGTON—JetBlue Airways said Tuesday it made an unsolicited $3.6 billion bid for Spirit Airlines, potentially snarling merger plans between the ultra-low-cost carrier and Frontier Group Holdings.
JetBlue Chief Executive Officer Robin Hayes said the deal would make the New York-based airline a stronger competitor to the so-called four legacy U.S. airlines that control nearly 80 percent of the U.S. passenger market.
