Originally Posted by
adspilot
Nope WRONG. It's not standby. I have A3 passed on MQ and AA leaving revenue standbys. When you check in for an A3 flight then it assigns you a seat. I have A3ed when they were calling for volunteers to take a voucher. If you still call it standby then we'll agree to disagree.
This is correct. If you don't check in before the flight fills up you can be denied a seat as A3, whereas A1 is "must fly" and they will bump revenue for you.