Instruction meant immediately enter and take off with traffic on short final..dont ask me the yank text but it was plain to me.
I should add that when in first flew into Kennedy in the late 70s I hadnt a clue even though I had writ down the clearance before hand...the ultimate was follow the rabbit speedbird heavy and contact the tower...
The worst lot are listening to the frogs (no I'm not racist as I is one)..how some of them are allowed to fly in international airspace I don't know...always worth a larf.