I can't remember where or how I pieced this together, but I'm guessing that each plane will have two dishes (which will be bonded together), and Starlink is expecting bandwidth to improve to Gbit speed, so it will probably be 2 Gb/s down for the whole plane. Still not great if every passenger is streaming HD video, but I imagine with some "traffic shaping" (aka throttling) it will be pretty snappy for web browsing and small file downloads.