The Federal Aviation Administration is investigating two airports for allegedly changing plans to add Chick-Fil-A restaurants after complaints about the company’s stance on gay rights.

San Antonio International Airport and Buffalo Niagara International Airport are under investigation for religious discrimination.

“The Department of Transportation has received complaints alleging discrimination by two airport operators against a private company due to the expression of the owner’s religious beliefs,” an FAA statement said. “FAA’s Office of Civil Rights has notified the San Antonio International Airport (SAT) and Buffalo Niagara International Airport (BUF) that it has opened investigations into these complaints. The FAA notes that Federal requirements prohibit airport operators from excluding persons on the basis of religious creed from participating in airport activities that receive or benefit from FAA grant funding.”

Chick-Fil-A, a popular chain, has come under criticism for its conservative stances, including being against same-sex marriage. Company president Dan Cathy has been quoted as saying the chain supports “the biblical definition of the family unit,” and the company donated $1.8 million in 2017 to groups with a discriminatory record against the LGBTQ+ community.

In a statement sent to CNN, Chick-Fil-A said, “We are a restaurant company … and we have no social or political stance. We welcome and embrace all people, regardless of religion, race, gender, ethnicity, sexual orientation or gender identity.”