Its design was based on the Mega Jet , a Mega Drive portable unit featured on airplane flights in Japan .
Late in the 16 - bit era , Sega released a handheld version of the Genesis called the Genesis Nomad .
Sega 's design was based on the Mega Jet , a Genesis   portable unit featured on airplane flights in Japan .
Late in the 16 - bit era , Sega released a handheld version of the Genesis called the Genesis Nomad .