dantsw13 » All airlines have overbooking profiles for flights, because, bizarrely, loads of people book flights and don't turn up!!!
Yep I left a seat free from Melbourne to Newcastle (UK) this time last year. the return was only £100 more than the 1-way at the time/deal so booked in just in case so I could move it but didn't end up using it. Having got sold out internal flights here in Oz they are sometimes fairly quiet.