The power for taxiing comes from the engines itself. If it is a propeller powered aircraft, the propeller provides thrust and pulls the aircraft, like it would in air. read more
Airplanes usually taxi using their engines. I have had a few cases where we were pulled out via a tug, but that is rare. Usually, all engines are started, prior to pushback. read more
Most aircraft taxi using their own engine power. Tugs are usually only used to get an aircraft to a safe distance away from all structures, people, and other aircraft before engine start, or if the engine(s) are inoperable (maintenance, mothballing, etc.). read more