Answer:
Angels and pilots work with me.
They come at night without being called and are lost in the day without being stolen. What are they?
I sleep by day, I fly by night. I have no feathers to aid my flight. What am I?
I fly forever Rest never.
Railroad Crossing, look out for the cars. Can you spell that, without any R's?
No matter how little or how much you use me, you change me every month.