Comment by labcomputer

I guess they are if you mean fly-by-piano-wire!

The (as of a this year) second-most popular airliner, the Boeing 737, has fully mechanical controls for the ailerons and elevator (with hydraulic boosting). Elevator trim is also mechanical.

The pilot needs to be built like a gorilla to fly it, but primary flight controls continue work, even with a total failure of all electrical and hydraulic systems.