Shake Shack Throws Shade at Chick-fil-A with Free Chicken Sandwich Sundays

Shake Shack is giving away free Chicken Shack sandwiches every Sunday in April with a $10 minimum purchase.

The promotion seems to throw shade at rival Chick-fil-A, which is famously closed on Sundays.

Shake Shack touts its antibiotic-free chicken, a "not everyone can say" quip about Chick-fil-A's recent policy change.

Chick-fil-A announced last month it will no longer serve 100% antibiotic-free chicken due to supply chain issues.

The Shake Shack promotion sparked a debate over which chain has the better chicken sandwich.