Ipad air headphone jack

You will need to purchase this adapter from Apple.

Tap the link below.

https://www.apple.com/shop/product/MU7E2/usb-c-to-35-mm-headphone-jack-adapter?fnode=74d6f5eed083a2ffb0db782df4fdf225367fc5de40da3860c8690540b3cf7500a1c265ecdf0fecf7e97d64a4b07ede162d8a4580bfe8c08cc32d755fd445fde7eb9a1825b74f7840ec2a4aba548cb8fae0ce87b169ab0bd6d74bd8759687c7bc

Best of Luck to You!

What iPhone 11 headphones?

Later iPhone models do not come/ship with the older iPhone wired earpods, any longer.

Are you referring to the older iPhone wired earpods with the wired, inline controls?

Yes, those will work fine for audio, but not sure if any of the wired iPhone earpod controls will work through the adapter.

Those earpods have an extra ring on its tip to be able to still use those control when plugged directly into an actual older iPhone or iPad headphones jack.

This is not the case any longer as the adapter changes to a Lightning connection at one end, so I am not sure if the inline controls on those old iPhone wired earpods will still work, or not.

I have no way to test for this.

Good Luck to You!