SONY WH-1000XM4

Unlikely. Probably just means it supports AAC as well as aptX and whatever else.

Nah, will just mean they've ticked some boxes, or more likely paid a fee, to be use that branding to say the item is compatible.

Wish I'd gone for these. My CA Melomanias don't fit my ears, despite the great sound 🙁

They've paid a fee to join the MFi program....

Made for iPhone, Made for iPad, and Made for iPod logos inform customers that an electronic accessory has been certified by the developer to meet Apple's performance standards. To use the logos, accessory makers must apply to be a MFi Program licensee, and receive approval from Apple.

https://www.macrumors.com/2018/03/12/apple-updates-made-for-iphone-ipad-ipod-logos/

Understood. Thanks all. I also should hold my hands up and admit that I have just notice the android logo next to them. For some reason I missed the robots head picture.
They are great so far, have moved from Bose qc35 to these. Each have their merits. I’m happy with these so far.

One advantage the Sony’s have, as I understand it, is that they still have a 3.5mm jack socket, and will work in passive mode if the battery dies, you just need a Lightning to 3.5 adapter. Amazon do an excellent one with a braided cover, and is about 3” long. You do lose any remote capabilities though. I had a 1.2m Lightning to 3.5mm Jack which I used with a pair of Beats Solos I got cheap, which had a remote, but I’ve recently broken the plug, and nobody seems to make them anymore, which is a pain. My new headphones are completely passive, no extra internal electronics like BT, so I’m a bit annoyed with myself for breaking the cable. Never mind, I rarely make or get phone calls anyway, so it’s no big deal.

The ‘phones were half the price of the Sony and Apple ones, so it’s a price worth paying.

If you fly long haul they come with the double prong adaptor. And you get noise cancelling. Done 4x 14 hour out and backs this year so far with my M3 headphones.

I have these but haven't flown long haul in years. What is the double prong thing for?

In really old planes they used to make headphone sockets in the seats with two mono jacks rather than a stereo one. No idea why. The adapter is for that.

I really do remember proper old planes using airtube style phones with two acoustic tubes to the earpieces.
My first flight was in a Dragon Rapide...

https://apex.aero/articles/sound-tube-surprising-history-airline-headsets/

In a time before airlines learned to charge for baggage, food, drinks, legroom etc they’d charge for special non standard earphones so that you could watch whatever film they decided to project onto a wall that if you were a small kid you could juuuust about see some of between the seats and peoples heads, and of course through the fug of cigarette smoke.

As many bags of peanuts as you wanted though (just keep pressing the hostess button until your mum tells you off except she’s doing the same for campari!) and you could go and sit in the cockpit which was cool.