On-the-go industry professionals are wise to be aware of the varying degrees of risk associated with airport wi-fi services. Cloud security firm Coronet has released a data report highlighting the most and least cyber secure airports in the U.S. The study ranks San Diego International Airport at the bottom, while Chicago-Midway International Airport comes out on top.

Coronet produced the report, “Attention All Passengers: Airport Networks Are Putting Your Devices & Cloud Apps at Severe Risk,” to inform business travelers of how insecure airport wi-fi can inadvertently put the integrity and confidentiality of their essential cloud-based work apps—G-Suite, Dropbox, Office 365, etc.—at risk, and to educate all other flyers on the dangers of connecting to unencrypted, unsecured or improperly configured networks.

“Far too many U.S. airports have sacrificed the security of their wi-fi networks for consumer convenience,” says Dror Liwer, Coronet’s founder and CISO. “As a result, business travelers in particular put not just their devices, but their company’s entire digital infrastructure, at risk every time they connect to wi-fi that is unencrypted, unsecured or improperly configured. Until such time when airports take responsibility and improve their cybersecurity posture, the accountability is on each individual flyer to be aware of the risks and take the appropriate steps to minimize the danger.”

The 10 most cyber insecure airports in America are:

1. San Diego International Airport
2. John Wayne Airport, Orange County Airport
3. William P. Hobby Houston Airport
4. Southwest Florida International Airport
5. Newark Liberty International Airport
6. Dallas Love Field
7. Phoenix Sky Harbor International Airport
8. Charlotte Douglas International Airport
9. Detroit Metropolitan Wayne County Airport
10. Boston Logan International Airport

The 10 least cyber vulnerable airports are:

1. Chicago-Midway International Airport
2. Raleigh Durham International Airport
3. Nashville International Airport
4. Washington Dulles International Airport
5. San Antonio International Airport
6. Louis Armstrong New Orleans International Airport
7. Kansas City International Airport
8. Lambert St. Louis International Airport
9. Miami International Airport
10. Tampa International Airport

To identify the airports with the greatest cyber risk, Coronet collected data from more than 250,000 consumer and corporate endpoints that traveled through America’s 45 busiest airports over the course of five months. Coronet then analyzed the data consisting of both device vulnerabilities and wi-fi network risks, which was captured from the company’s threat protection applications. Following the completed analysis, the data was combined and standardized to compile an Airport Threat Score. The greater the vulnerability for devices and networks, the higher the score assigned.