This episode was pretty good, and even had a couple series plot-forming events. Charlie's relationship with Dad is strengthened as Charlie is taught to play golf. Also, Charlie's now former student Amita is staying around. As for the main plot line of the episode, I felt this was quite interesting, especially the "squish-squash" mathematics, and the layered radar screens that created a once undetectable aircraft into a decent picture of the aircraft itself. However, two things could have put this episode over the top. First, a scene on how this vertical take-off craft works (theoretically) by mathematics would have been neat; they could also have created video of the take-off and trip of the craft in a flash-back. Even if it was all done by computers, that would still be pretty awesome to see.