I went back into my game to see how often the planes appear because I found another thread where people said that it was due to using TC which made it seem like they were appearing constantly. With the stop watch activated in November 1942 in an S-boat in the Bismark sea, the aircraft keep appearing one after the other during daylight. When one disappears another appears imediately or within 15-30 minutes! That's a bit much methinks!