When the movie begins on your next long flight, plug AirFly into your seat’s headphone jack and listen to the film with your AirPods. AirFly uses Bluetooth to connect your wireless earbuds or headphones to in-flight entertainment systems. No more lugging wired headphones or settling for those flimsy airline headphones. Enjoy high-quality sound thanks to a device about the size of an AirPod charging case… More here.
Great name, good product, a bit pricey.
McGST 
Also a bit noisy! At least to the extent if it was a long trip, you might miss not having noise cancelling. But this is much easier to pack 😀
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One more thing to lose on your trip.
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The pricing is not too far out of kilter with the many, many other very similar devices out there: https://www.amazon.co.uk/s/ref=nb_sb_ss_i_3_10?url=search-alias%3Daps&field-keywords=3.5+to+bluetooth+transmitter&sprefix=3.5+to+blu%2Caps%2C173&crid=219T5C3982EO1
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