O/T is paid at a rate of 1.25 so isn't particularly appealing to many! Certainly when they are desperate the offer of Clash and Protect is there which basically means you go on a trip earlier than the one you were rostered often over a weekend but you keep the credit for the trip that you've been clashed off so essentially you are paid twice which is lucrative if you can get it.! (Hope that makes sense)
It has all but dried up on the 744 in the RHS this year it could well be there on other fleets though but its best not to count on it as its not consistent generally.