Three ways to slow a jetliner, wheel brakes, reverse thrust, and
ground spoilers on top of the wing.
The "blades" do not change pitch, the exhaust out the rear of the
engine is turned around by deflectors.

Bob Moore
ATP B-727 B-707

Actually you forgot the fourth and fifth way... 4: Drag, 5: Obstacles.

Capt. Dan
L10-A-Lemon, Diesel-9