Answer:
I save lives on the ground and in the air
I am mother and father, but never give birth or nurse. I'm rarely still, but I never wander. What am I?
I can be found after you remove 6 letters from BSAINXLEATNTEARS
There was a girl half my age when I was 12, now I am 66, how old is she?
You can catch me but cannot throw me. What am I?
No matter how little or how much you use me, you change me every month.