Mix together on a small plate flaky sea salt and ground cinnamon.
Rim each glass with a lime wedge before dipping into the cinnamon salt.
In a large pitcher, combine the apple cider, lime juice, apple spiced syrup, orange liqueur, tequila, and corn liqueur.
Stir well until fully combined.
Refrigerate until ready to serve, or serve immediately.
Rim glasses with the cinnamon salt mixture and fill with fresh ice.
Pour the margarita over ice and garnish with a thin apple slice, cinnamon stick, or lime wheel if desired.