Place eggs in blender and whip for 15 seconds; add sweetened condensed milk, evaporated milk and whole milk to blender , whip for 30 seconds. Set aside.
Place sugar in dry saucepan. Cook over medium-high heat. After 5 minutes sugar begins to clump up. Break up chunks with a wooden spoon. Continue to cook sugar until it liquefies and turns light caramel color.NOT to dark or you will have a burnt flavor.
Pour caramel into sprayed lightly bundt pan and using a wooden spoon, spread caramel 1/2 way up sides and middle tube of pan too. Place in a roasting pan.
Pour custard into bundt pan.
Place roaster and bundt pan in oven; then pour hot water into roasting pan, about 2 inches deep. Bake for 45 minutes or until knife inserted in center comes out clean.
Remove from oven, let cool in bundt pan for 15 minutes- then loosen the top edge of flan from pan so as not to disturb the caramel that is 1/2 way down.
Tilt pan back and forth until you can see the caramel oozing up the sides of the pan. Cover and chill for 6 hours or over night.
Place plater on top of bundt pan. Holding tight against each other;flip over carefully so you don't lose the wonderful caramel.
Store any left over flan in the refrigerator.