[FireBeyond]

> Involuntary bumping requires the airline to pay cash if the passenger insists on that.

Not even "insists on it", they are required to pay cash or check, only, for IDB.

Their "dirty little secret" (which makes it sound 'naughty', as opposed to the more accurate 'illegal') is that for many years they've been offering vouchers in this situation.

And then there's this argument that the gate agent came on to the plane, and asked for volunteers, and then having no/not enough volunteers began involuntarily denying boarding, and the argument is that "having boarded, any removal of a passenger is involuntary, because by definition/law, voluntary denial doesn't involve demanding passengers give up seats after boarding or refusing to fly the aircraft".