Answer:
If you are unsure how to use one then just ask a flight attendant.
This is your stomach's way of letting you know you've neglected it.
Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?
What is found over your head but under your hat?
What hangs in the sky by day but at night goes away?
I break away from my pack. I create holes in my victims. I can travel for miles and then disappear. I am part of a dying breed. What am I?