Final answer:
Peter believes that the key to learning how to fly is one's own spirit, along with the necessary physical means to do so.
Step-by-step explanation:
Peter believes that the key to learning how to fly is one's own spirit. In the play, 'Peter's Choices', Claire expresses her belief that flying can make a person feel free and give them a different perspective on the world. Peter believes that the key to learning how to fly is one's own spirit, along with the necessary physical means to do so.
However, Peter also realizes that in order to fly, one must have the ability to actually physically take flight, which can only be achieved by having wings or some form of propulsion. Therefore, the key to learning how to fly is a combination of having the desire and spirit to fly, along with the necessary physical means to do so.