AirFly 2 from Twelve South can wirelessly connect your AirPods to any 3.5mm audio jack. It's great for airline entertainment systems and gym machines. The
Twelve South AirFly SE Review: Is It the Ultimate Audio Transmitter?
MEE audio Connect Air In-Flight Bluetooth Wireless Audio Transmitter Adapter
Review: AirFly by Twelve South -- use your AirPods with any headphone jack - iPhone J.D.
Twelve South Airfly Duo Wireless Transmitter Audio Sharing For Up To 2 Airpods /wireless Headphones Any Audio Jack For Use On Planes,gym,home,auto : Target
NO MORE LIMITATIONS: Wirelessly transmit audio from in-flight entertainment, gym equipment, gaming devices, TV's or any 3.5 audio jack. Use your
Twelve South AirFly Duo | Bluetooth Wireless Transmitter with Audio Sharing for up to 2 AirPods / Headphones, Use with any 3.5 mm Jack on Airplanes
Connect your AirPods or Bluetooth headset to any device with a 3.5mm audio jack using this wireless dongle - Yanko Design
AirFly Pro Bluetooth Wireless Audio Transmitter Review
AirFly connects your AirPods to anything with a headphone jack
Product Review: Airfly Pro Bluetooth Adapter for Airplane IFE - Travel Season