Final answer:
Aristotle Onassis ran Olympic Airways from 1957 to 1975 and was married to Jacqueline Kennedy, making her Jackie O. John F. Kennedy was president known for his youthful image and optimism, but had no role in Olympic Airways.
Step-by-step explanation:
From 1957 to 1975, Greek shipping magnate Aristotle Onassis indeed ran Olympic Airways. Onassis was also famously known for his marriage to Jacqueline Kennedy, the widow of U.S. President John F. Kennedy, after which she became known as Jackie O. This union was significant and contributed to the blending of business influence with iconic American history. John F. Kennedy is often remembered for his presidency that symbolized a new era of American optimism and youth, as well as for his ill-fated assassination in 1963. Despite President Kennedy's own connections with high society and air travel lore, he was not involved with running Olympic Airways. Thus, the correct answer to the question is a) Aristotle Onassis.