 Well, VPNs are more likely to drop off in flight, and that leaves you unprotected and out in the open. It's not the VPN's fault, by the way. It's the fault of the airline and the Wi-Fi that still needs some major improvements. So if you're going to be using the Wi-Fi on the plane, make sure you're updated with the latest antivirus software because hackers on the plane can scan your computer, steal your passwords, and your safest in-flight activity is old school. Order a drink and read a magazine.