Originally Posted by
ralfp
Take this sequence of events:
- Oversold flight, GA asks for volunteers in exchange for a $400 (for example) voucher.
- A naive passenger volunteers decides that's a good deal.
- Said passenger gets and reads* the form.
- Decides that the T&Cs are not what he thought they would be and refuses to fill out the form.
- Asks to board
- Is not allowed to board because he has lost his seat in the meantime.
Are you saying that this is not an IDB situation?

I thought a VDB required that the volunteer voluntarily agrees to the compensation.
*: I'll admit that that is not likely to happen (reading the form).
Originally Posted by
ConciergeMike
Yes. IDB is when the airline comes to you and says, in essence, "You are not getting on the plane, despite what you may think." Not agreeing to VDB terms and then as a result of losing that time being unable to board should not create an IDB payout. The I in IDB was created by the passenger, not the airline, since the hypothetical customer refused the terms of the VDB.
It is rare that I split from my boy CMike, but Ralfp is correct here. Until the flight is dispatched you may unvolunteer at ANY time and for ANY reason and demand a seat. The airline must follow their published IDB procedures in the event this creates an IDB situation.
I would imagine that after the flight has left it would be unfair to the airline to allow a person to unvolunteer. So either a ticket refund or the compensation and the later flight would be ok.