Jet was originally released by SubLogic in 1985 for the Commodore 64 and DOS and was one of the earliest combat flight simulators. It was also ported to the Atari ST, Amiga and Macintosh over the next few years. An enhanced version called Jet 2.0 was released for DOS in 1987.
The above ad isn't very specific, but giving the timing (1987), it was probably referring to Jet 2.0. The packaging wasn't significantly different (just a sticker added to the top saying "Version 2.0") so I guess there's no reason to expect different ads. Also, original Jet ports were still being released for other machines after Jet 2.0 was released.
Jet 2.0 was basically the same game but it did feature a number of improvements, including better speed. The simulator was also made more accurate and new improved graphics modes were added. Finally, mouse control and the landing gear was added.
Even before Jet 2.0 was released, the original received pretty good reviews in general on all platforms. Jet let you pilot either an F-16 or an F-18 in various combat scenarios or just in free flight.
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