S2·E10 Now You See It...

While practicing flying in the desert with Bill, Ralph gets a vision of a plane crash. It's the suit showing it to him, and Bill can only see it when he touches Ralph. They rush to the scene to find no plane, and figure out that it must be something that hasn't happened yet, and they're supposed to prevent it. We come to find out that Pam is on that plane, and it's been hijacked. To make matters worse, the plane has an experimental cloaking device that makes it invisible to radar, and the Air Force would rather shoot it down than have the plane in enemy hands.