![spirit_airlines_500px](https://www.ibj.com/wp-content/uploads/2019/01/Spirit_Airline_plane_500px-300x199.jpg)
Spirit Airlines shareholders approve $3.8B sale to JetBlue
JetBlue emerged as the winner in a bidding war with Frontier to acquire Spirit, the nation’s biggest budget airline. But the deal could still face a challenge from federal antitrust regulators.