Sega Mega Jet was a handheld Sega Megadrive that was rented for use aboard Japan Airlines airliners.

The Mega Jet was developed in 1992 as a promotional item used by the airline. The unit has no built in screen, nor does it require one. The unit is plugged into an LCD television that folded from the armrest. Four games for the flight are availible, including Super Monaco GP, and Sonic the Hedgehog. The Megajet was availible in limited quantities in department stores, as it was being marketed in Japan as a portable Megadrive.

The development of this console would later result in the Sega Nomad, which was a portable Sega Genesis (North American equivalent of the Megadrive) with a backlit screen, availible after its release on October 1995 in North America.