I recently flew across country with jetblue and since I haven't flown in over 10 years I appreciated the wifi. However, I found I couldn't stream a music video on my phone without buffering. Fortunately if I turned off the video the music played fine. It was OK for reading hacker news and the like.
On the return flight it just didn't even work. Fortunately, I'd had newpipe download some content before we left.