Was quite surprised when I realized that my $500 Apple headphones didn't come with a wire for wired connections.
Anyhow, I went and bought the $35 Apple-branded Lightning to 3.5 mm Audio Cable that specifically mentions "Connect your AirPods Max or Beats Solo Pro headphones to the audio-out port on an airplane, iPhone, iPad, Mac, or other device."
But nothing worked. Apparently this has not been working properly for years. I could try and get them replaced but it seems to be a lottery if
a) Apple lets you replace them
b) You get a pair with firmware that for some reason works
Anyhow, I went and bought the $35 Apple-branded Lightning to 3.5 mm Audio Cable that specifically mentions "Connect your AirPods Max or Beats Solo Pro headphones to the audio-out port on an airplane, iPhone, iPad, Mac, or other device."
But nothing worked. Apparently this has not been working properly for years. I could try and get them replaced but it seems to be a lottery if
a) Apple lets you replace them
b) You get a pair with firmware that for some reason works