Wartime airborne ASW weapons and Fido

Did airborne anti-submarine torpedoes exist during World War II, and does Fido count?

Wartime development existed, but it had not matured into service, and Fido's mine-derived design makes it a precursor rather than a conventional ASW torpedo in this account.

Weapons under development were different from an established operational torpedo capability. A documented example of an aircraft prosecuting a submarine with an aerial torpedo during the war would overturn this assessment. No operational example is offered; the weapons are described as being in development and testing rather than regular service. Fido was a mine-derived acoustic hunter with limited range, not a conventional fleet torpedo in the later sense. Its reputation as the ancestor of homing anti-submarine torpedoes can obscure how it was designed and classified at the time.