Gay rights activists planned a “kiss-in” at outlets of a popular U.S. restaurant chain Friday in response to the owner's public opposition to same-sex marriage.

Dan Cathy, the president of Georgia-based Chick-fil-A, recently told a religious news journal the company was “guilty as charged”, saying the family-owned business supported “the biblical definition of the family unit.”

His remarks angered politicians in Chicago and Boston, and sparked outrage among gay rights advocates. One group says the company has donated millions of dollars to groups that have campaigned against legalizing same-sex marriage.

Thousands of people lined up at the company's outlets across the U.S. earlier this week in support of a “Chick-fil-A Appreciation Day.” It was response to a campaign begun by former Arkansas Governor and Republican presidential candidate Mike Huckabee, who called on opponents of same-sex marriage to eat at their local Chick-fil-A restaurant on Wednesday in a show of support.

A company official says the fast-food chain enjoyed an “unprecedented” day of turnout and sales at its 1,600 restaurants.

Chick-fil-A, founded in 1967 by Cathy's father, S. Truett Cathy, posted more than $4.1 billion in sales last year. None of the restaurants are open on Sundays, when many Christians in the U.S. attend worship services, in keeping with the Cathy family's beliefs.