I remember reading about this sweet, semi-portable system in the pages of DieHard GameFan magazine back in the day.
Although initially produced for the folks at Japan Airlines, who rented the systems to game-starved passengers, the Mega Jet eventually (in early 1994) made its way into the public sphere, too--with a rather attractive price tag of about $123.
I'd actually buy one if I could find it at that price. (I'm a total sucker for small, 16-bit systems, after all--as evidenced by my many PC Engine posts.) Unfortunately, the cheapest the system is going for on eBay right now is $335. (Here's the auction, in case any of you are interested.)
Oh, well, maybe I'll buy a CDX instead...