Timmy: Would you like a receipt? cheapest generic cialis online No. Look at the landing threshold. It should be, relative to the rest of the stuff in your band of vision, at the same place it was when you first saw it. It'll get bigger and bigger, and bigger and bigger, but it won't move. Is that's the case, your ground speed is sufficient to land in the touchdown zone properly. So there were at least two cues -- one electronic, and one visual, that the pilots were relying on.