Interesting, thanks for the info on that. I was on an international Air Canada flight last week and they specifically announced that nothing wireless at all was to be used during the flight, including all headphones.

EDIT to add the official policy: "Air Canada is happy to announce that, beginning on April 1, 2018, passengers on our flights will be able to use their personal headphones (of any kind) on our in-flight entertainment system or their personal mobile devices. This service is available from gate to gate at any time, except, of course, while the safety video is being played. Please note that wireless or Bluetooth headphones may be used only on flights with WiFi, because of their technology."

https://www.aircanada.com/ca/en/aco/home/book/travel-news-an...

My flight was definitely a non-wifi flight, so I guess that was the issue?

Confusingly I think this means that you can only use wireless headphones with the 'provided entertainment' when the flight has Wifi because that's how they get their entertainment to your device. If the flight doesn't have wifi you have to use the in seat entertainment system and therefore can't use wireless headphones (because the entertainment system doesn't support them) not because you're not allowed to have them enabled.

Maybe the poster meant that you cannot plug in your wireless headset to the aircraft's entertainment system, as you can with a 3.5mm jack.

Uhh this depends on what kind of headset.

My Bose AE2 wireless headphones are wireless, but also come with an audio jack for wired connectivity.

I can't say, but IME all major American airlines hand out free wired headphones on flights.

Only on international flights.

> Only on international flights.

It's not only on international flights. They'll do it on reasonably long domestic flights as well (e.g. JFK→DEN).