Hope nobody minds me renewing the life of this thread. I just have a quick question: Stuck mikes seem to be fairly common, so how often is it that they occur in extremely busy areas, say for example, PHL or BOS approach, or even a center. Are controllers taught how to handle such a situation. Things could turn very messy if there was a sudden loss of radio communications for everyone on the frequency. I imagine it would be difficult to figure out which light signal would apply to which aircraft. Anyway, as a pilot, what should be done in such a situation? Change to the ground frequency, or the tower, as other posters in this thread have said?