In Kennedy tower normaly operates like this:
- 3 inbound planes for 31L
1x AAL 767, 1x BAW 747, 1 JBL A320
The 767 just touched down and is exiting the runway
ATC would do the following AAL101 turn right into juilet, hold short of bravo - contact ground 121,75.
Then ATC would not talk to Speedbird501, cause he cleared him land even before AAL101 touched down.
NOW ATC willt talk to JBL4:
"You are following a heavy Boeing 747 on a 3,5mile final. Report traffic in sight?"
- Traffic in sight
"JBL4 runway 31L cleared to land"
- Rwy31L cleared to land JBL4
At this moment Speedbird501 touches down. But as most of the time, the british pilots are a bit slow. (This has been confirmed by JFK Tower stuff). And not moves off the runway.
Now either the tower will tell JBL4 to go around, or JBL4 will do it on his own.
Its a bit tricky with those landing clearances in advances, but its effective. You can concentrate on the next task rather than clearing them to land "manualy". I know there is a word for those clearances, but I cant remember.
I just love those guys over at http://www.jfktower.com
Check out their forum, its a nice place.