In the book 'James and the Giant Peach', the plot and reading the book reveals that the power used to make the peach float through the air was a bunch of seagulls. Since they were in shark invested water they knew that they needed to get into the sky before it was too late, so they set a trap using worm as bait for the seagulls and captured them.
Hope this helps! If you have any other questions or would like further explanation just let me know! :)
