If hearing aids can enter pairing mode without using a phone and they use standard Bluetooth (versus BLE), they can typically connect to the AirFly. However, this is not a use that we officially endorse because compatibility varies considerably among hearing aid brands.
Please note that, according to Oticon, the AirFly will not pair directly to Oticon hearing aids because the aids use Low Energy Bluetooth (BLE) to help conserve the battery. The AirFly uses regular Bluetooth, so they do not speak directly to each other.