Best fluff key lime pie recipe?

I cant seem to find a recipe for light fluffy key lime pie! All of the ones online use sweetened condensed milk and butter, and these just turn out like an ultra sweet lime custard. I want a recipe for pie like the frozen key lime pies (like Marie calendars) they are light and airy! Thanks :)

This one has sweetened condensed milk but no butter.
Only 3 ingredients plus the crust.
I've made it many times and it always gets rave reviews.

http://www.keylimejuice.com/recipes/nellie-joes-key-lime-pie.htm