Most airports provide free Wi-Fi for visitors. This is convenient for business travelers who work on their laptops while waiting for their flights.

Taking advantage of this convenience can be risky. The risk level, though, is not the same across all airports, according to a Coronet study. The security researchers came to this conclusion after they gathered and analyzed data from the 45 busiest US airports over a five-month period, starting in January 2018. Click here to learn which four airports turned out to be the riskiest for free WiFi users.