Hi,
Probably the flight ... since the whole computing age, is still young and will need a few more years. Flying now is in its 100 years ... so we should know better about computers in another 50 or so.
As of right now, I would say flying ... but computers are a close 2nd. I would think that the ability to add a "keyboard" to what was a synthesizer in the 1950's would be much more important than the Commodore was, since it was really a culmination, or a gathering of a lot of previous details and things put together.
The airplane, by comparison, had its dream origins way back way over one, two or three thousand years ago. Even Leonardo thought something like it would happen.