Click or tap on the ad to reveal the answer.
How to guess it?
The clues were mostly in the advertisement's text. Which airline claimed to have the "biggest business computer" back then? Which airline used this font in its advertisements? But... I think pretty much the only solid way to guess would have been the last sentence of the text: "That's the ... way." Even today, this airline uses this phrase, including as a title for its inflight magazine.Remember to read carefully the introductory text. Even though it is not part of the ad itself, it is important. This was an advertisement for a United States airline, so the possibilities are much more limited then.