Teacher:Generate a correct and concise answer for the question based on the words in the context.
Teacher: Now, understand the problem? Solve this instance: Context : The Bell P-63 Kingcobra is an American fighter aircraft developed by Bell Aircraft in World War II from the Bell P-39 Airacobra in an attempt to correct that aircraft's deficiencies.
Question : Which is the basis of Bell P-63 Kingcobra?
Student:
Bell P-39 Airacobra