Part A: The excerpt that best summarizes the main ideas of the text is:
Amelia Earhart flew her last flight more than 80 years ago, but the pioneering spirit of flight lives on. And in the age of space exploration, the sky is no longer the limit. (paragraph 1)
Part B: The two key details from the text that best support the main ideas from Part A are:
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And now here at NASA, a lot of new spacecraft is coming online and we’re doing a lot of new exploration. (paragraph 2)
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Orion spacecraft are going to take people to the moon and then lay the groundwork for us to venture to Mars. (paragraph 6)
These details illustrate the ongoing spirit of exploration in aviation and space travel, aligning with the theme presented in the main excerpt.