United Airlines will launch its first commercial flight with Starlink Wi-Fi this spring. It's accelerating its timeline for the new internet service, which is a subsidiary of Elon Musk-owned SpaceX. United plans to have its entire two-cabin regional fleet use Starlink by the end of the year. The satellite-based Wi-Fi will be free for members of MileagePlus, United's frequent flyer program. Testing begins next month on the system.