It is assumed you mean the meet and greet with a CP, or Manager.

It is very much like a mini interview, but even more informal and informative. You will have more time to ask questions about Delta and the Captain, or Asst. Chief's, are great folks & easy to talk to. Although it might feel like meeting a friend for coffee, realize that you are being evaluated and the better prepared you are, the better an impression you will make.

Be ready for the easy questions:
"Why do you want to work for Delta?"
"What do you have to offer Delta?"
"Tell me about a time you (had to take action to ensure safety, helped out a passenger, etc...)"

Also, I got some of the tough questions, like:
"What are your weaknesses?"
"When have you made a mistake and what was the outcome?"

The Pre-Screen is a good opportunity which results in the CP's office sending an e-mail to the Recruiting Managers reccommending you, which is a strong reccommendation.

Emerald Coast I'm sure would do an excellent job preparing you, or even Air Inc. Even better if you get one of Delta's retired Captains for the interview prep. Obviously they have broken the code. My prep was provided by a Captain who had taught "In Command" for Delta and we worked together to refine my answers to hit on the points that Delta cares about - safety, efficiency, customer service.

Also, it is a good time to get gouge for the next step in the process. The CPs and Managers have all been through this process themselves and they were selected by Delta. They know the process, they also have been in your shoes, they are great sources of information.