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Because UFO's are not aircraft, which means a UFO does not rely on aerodynamic forces acting upon itself to enable itself to fly, which would otherwise create sonic booms if a UFO did rely on aerodynamic forces to remain in a state of flight while moving through the air at a speed which exceeded the speed of sound.
An aircraft is a machine or device that derives it's 'lift' from the surrounding air which supports it's weight while in a state of flight, which means that an aircraft can only fly within an atmosphere where air exists, which is also why it is called an "air craft".
An aircraft is a machine or device that derives it's 'lift' from the surrounding air which supports it's weight while in a state of flight, which means that an aircraft can only fly within an atmosphere where air exists, which is also why it is called an "air craft".