Answer:
The correct answer is: by helicopter.
This is known as the Operation Frequent Wind, and it involved US personnel and a lot of South Vietnamese refugee who were working with the US, and who were in danger of retribution by other Vietnamese.
It had to done by helicopter because the airport was damaged.
Explanation:
Wendy might not want to grow up, but she accepts the inevitably of it from an early age, unlike Peter. We know this because the narrator tells us: All children, except one, grow up. They soon know that they will grow up, and the way Wendy knew was this.