Final answer:
The question asks why Jonas was fascinated when he saw a plane, but the context isn't provided. In the related case study, Antônio and not Jonas is taking a flight and observes another passenger moving around for health reasons, not out of fascination.
Step-by-step explanation:
The question seems to be referring to a character named Jonas who is fascinated with seeing a plane. However, there isn't enough context provided to accurately determine why Jonas was fascinated. Typically, characters in literature may find planes fascinating for a number of reasons including the sheer amazement of flight, the technology behind airplanes, or perhaps the character has never seen a plane before which could be tied to the character's background or setting of the story.In the provided case study, however, Antônio is the one taking his first plane flight and not a character named Jonas. Antônio observes an older man named Ahaya walking up and down the airplane aisle after the pilot announces that passengers can move around the cabin. The reason for Ahaya's pacing isn't connected to a fascination with planes, but rather a health-related practice to prevent a blood clot from forming in his legs, which can be a risk during long flights due to prolonged sitting.