Ground Stops and Ground Delay Programs

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I'm looking for some help understanding Ground Stops and Ground Delay
Programs...

In order to reduce arrival rates airports have the following 'tools' to
use...

1. ask a flight in the air to 'Slow Down'
2. ask a flight in the air to 'Hold' over the airport
3. issue a 'Ground Stop'
4. issue a 'Ground Delay Program'
5. other

My understanding is that Ground Stops and Ground Delay Programs only
affect flights that have *not* left the departure runway yet. So, once
in the air a flight cannot be affected by the Ground Stop or Ground
Delay Program tools, but can be affected by the Slow Down or Hold
tools.

Is this correct? If I was, for example, creating a report of all
flights affected by a particular Ground Stop or Ground Delay Program,
can I simply ignore the flights that departed *before* the Ground Stop
or Ground Delay Program was issued?

Thanks.

[Capt.Doug]

>bobfuller30004hotmail.com> wrote in message
> My understanding is that Ground Stops and Ground Delay Programs only
> affect flights that have *not* left the departure runway yet. So, once
> in the air a flight cannot be affected by the Ground Stop or Ground
> Delay Program tools, but can be affected by the Slow Down or Hold
> tools.

That is correct.

> If I was, for example, creating a report of all
> flights affected by a particular Ground Stop or Ground Delay Program,
> can I simply ignore the flights that departed *before* the Ground Stop
> or Ground Delay Program was issued?

Depends on the report.

D.