The letters SBY appear on a boarding pass when your boarding is subject to space and dependent on the waiting list at the airport to confirm your seat.
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Standby passengers who don't get seats are rolled into the standby list for the next flight. Standby passengers typically have priority based on how much they paid for their tickets and their relative status in the airline's frequent flyer program.
Every airline has its own priority system, but in general, the order for boarding standby passengers is as follows: Full-fare passengers. Commuting flight crews. Standby passengers from the airline (in order of seniority or time of check-in)
Sometimes, when an airline asks for volunteers to give up their seats and fly on a different flight, there are not enough volunteers. When this occurs, the airline will select passengers to give up their seats. This is called “involuntary denied boarding” or “bumping.”
One is to check in early. Once you check in, you'll probably get a seat assignment, and the chances of getting bumped decrease. Don't wait to board! If you're not in your seat, the airline may assume you won't show up and give your seat to another passenger.
Reserve flight attendants are usually on reserve 18 to 20 days per month, but it can be even less. The more seniority a reserve accrues, the more days off they may be able to have.