Yes, the Boeing 747–400, like all the previous Boeing 747 can reverse all four engines when on the ground during landings.
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The An-2 is one of the largest single-engine biplanes ever produced. It was particularly prized for its versatility and extraordinary slow-flight, short takeoff, and landing capabilities. In fact, the An-2 has no published stall speed, and pilots have been known to fly the plane under full control at 30 mph.
It could suck you in and less than a second later blow you out the rear as a lovely pink mist, then the engine will likely explode. Why don't high bypass jet engines have a variable pitch on the engine fan?
Crashes that destroy the airframe are the most obvious answer, but minor, low-speed incidents on the ground can also bring a plane's career to an end. This was the case for a SaudiaBoeing 747-300, which taxied into a ditch in Kuala Lumpur in 2001.
All large commercial jets can land automatically, but still with plenty of pilot involvement. So-called autoland systems are a part of aircraft autopilots. All large modern jets are equipped with such systems, which can automatically land the aircraft, albeit under careful supervision from the pilots themselves.
These tiny holes, also called breather holes, serve as a safety function, by making sure that the outer pane bears all the air pressure (the pressure inside the cabin is much higher than outside). This also ensures that in case the pressure difference becomes high enough, it is the outer pane that breaks off first.
All modern commercial aircraft have automatic brake systems. Just like a car, these systems also have an anti-lock braking system (ABS) that prevents the tires from sliding down a wet runway. The advantage of the automatic brake system is that the aircraft brakes comfortably at a constant deceleration.