"Steven P. McNicoll" wrote:
FAA Order 7110.65P Air Traffic Control
[...]
the pilot subsequently reports:

1. The airport or the runway in sight at airports with operating control
towers.

2. The airport in sight at airports without a control tower.

Why the distinction? Given that the runway is part of the airport,
under what circumstances could you possibly have the runway, but not the
airport, in sight?