Faucet having extendable aerator

A faucet includes an aerator including a projection; a coupling member including a protrusion, a cavity engaging the projection, and a stud; a spout including a well for receiving the protrusion, and an aperture for receiving the stud; a mounting component releasably secured to the spout and including a side extension, a thermostatic mixing valve in the side extension, a fastening member secured to the thermostatic mixing valve, and a handle releasably secured to the fastening member; a hot and cold water passages pipe in the mounting component and including an outlet passage and two inlet passages all in fluid communication with the thermostatic mixing valve; a tube member having one end in fluid communication with the outlet passage; and a spout tube having one end in fluid communication with the other end of the tube member and the other end in fluid communication with the aerator.