Be prepared immediate?
As I understand it, being cleared immediate T/O when not yet lined up means line up and take off without delay. That's fine.
But what do you guys genuinely expect when we get the clearance "...behind landing 737 3 mile finals, line up be prepared immediate."
We can't do anything until the landing aircraft has cleared the rwy so what's required here?
Having sat there for 20 secs or so, we're hardly likely to wait another minute or so after receiving T/O clearance so why use the 'immediate' call?
Not having a dig by the way, just keen to know why it happens.