I am confused. I thought airlines can try & see if there are willing pax to voluntarily give up their seats before IDB. If VDB compensation is compelling, I would imagine there will be pax giving up their seats voluntarily. If this is the case, why does it still need to be reported IDB??
LAX
The issue is whether or not it's the cusotmer's choice not to fly.
A VDB is a volunteer who responds to the airline's solicitation for volunteers.
An IDB is someone who is told they're not flying, irrespective of which compensation method they choose.
If someone is on a $39 SFO-LAX supersaver, and is told they can get $156 cash or a $400 cert, they may take a $400 cert. They're still an IDB if they want to fly on the original flight but the airline is making them take a later flight due to the oversale. In other words, they're still IDB but waiving their right to cash compensation in exchange for more favorable voucher compensation.