ATLANTA (AP) — Delta Air Lines says it’s no longer allowing passengers to fly with “pit bull type” dogs as service or support animals.

The Atlanta-based airline describes its ban announced this week as an “enhancement” to its policy on animals in passenger areas. Delta also says it’s limiting travelers to a single emotional support animal per flight. The changes take effect July 10.

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The airline’s statement says its new ban on pit bull type dogs responds to “growing safety concerns” after several employees were bitten. But the ban is prompting a social media backlash, and figuring out exactly which dogs fall under the policy could be a challenge.

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Delta describes them differently, as “Bull type dogs,” on its online list of prohibited animals, which includes reptiles, spiders and goats, among others.

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