At most Subway locations you'll get shredded iceburg lettuce. but if iceburg isn't the only lettuce you will eat, a nice leaf lettuce that you have julienned or cut into shreds. Subways uses Light mayonnaise in their chicken salad.
In a medium bowl toss chopped apples with squeeze of lemon juice.
Add celery, raisins, cranberries and chicken. Season with salt and pepper to taste and mix. Fold in mayonnaise.
Split a whole wheat sub roll horizonally without cutting all the way through the roll. Add about 1/3-1/2 cup shredded lettuce. Add veggies of choice, and finish with desire amount of chicken salad. You will have enough chicken salad for two 6 inch subs.