Pineapple Punch with Ginger

3 ounce packages fruit flavored gelatin mix
4 cups white sugar
13 cups boiling water
46 ounce cans pineapple juice
16 ounce bottle lemon juice concentrate
2 liter bottles ginger ale, chilled

In a large bowl, combine gelatin and sugar. Stir in boiling water until mixture is dissolved. Stir in pineapple juice and lemon juice concentrate. Divide into 2 containers, and freeze until solid.
To serve, place gelatin mixture in punch bowl, and chop into pieces. Pour in ginger ale.