When traveling to Atlanta airport from Alabama where is best place to park and get to airport?

at the airport parking lot

The airport has both a North and South parking decks. You have the option of hourly parking and economy parking for a day or longer. Its only a few minutes walk from the parking deck to the terminal. Check out the link and it gives you a better detail of how much the costs are.

There are several park and ride lots along Camp Creek Parkway, on the way to the airport.....I recommend those lots if you must fly out of Atlanta, but from a friend of mine, I would recommend flying out of Birmingham, or Chattanooga, because these airports are less crowded, and less chaotic.