Many individual WestJet Connect users in the past have transferred over 1GB of data in a 4 hour flight from the logs I reviewed a couple of years ago, with a high of 6GB on a 10hr flight. The old Gen 1 modems (which by now should already have been replaced with the up to 400 Mbps Gen 3 modems) were capable of 20Mbps per aircraft. It depends on the number of concurrent users and the real-time availability of bandwidth on a given satellite (which is shared between all providers using the same satellites, whether it is Panasonic or Gogo). WestJet doesn’t buy bandwidth at all, Panasonic fully manages the Internet service for them, as it does for United Ku (not ATG), Emirates, etc, over the same links and ground stations.

Most airlines have the provider block streaming services explicitly at the moment as they don’t generally use efficient video codecs (that may change with general availability of MPEG-5), JetBlue has been an exception in the past due to the nature of the Ka satellite spot beams they used over the Continental US, but that bandwidth wasn’t available in most other places, so has not been used by airlines who fly over much water.