Personal Air Vehicle (PAV) has been regarded as a future on-demand transportation system since aviation era came true. Since then various types of PAV had been tried, but no one succeeded yet. In 21 century, technology revolution in IT and UAV makes it feasible to develop practical PAVs in near future. In 2003, NASA proposed a new PAV concept and expected its market size as 3% of automobile market. It provoked a new research momentum in PAV technology. Recently, transportation service companies like Uber became interested in PAV and set up business models for PAV. In this paper, these all history and trends are reviewed and feasible types of PAV are presented.