I was on 104th server on Saturday and saw a jet, F15 i think shoot a ka50 down who was high and had his nav lights on, not a good idea. I was only about 3kms away and my first instinct was to jam on the brakes and get into a low hover, He turned a 270 and then flew around me and smoked another ka50 who was behind me and up high, estimate about 200m, I reckon staying below the horizon and slow is your best defense, harder to catch the eye of the jet pilot when not moving. AND turn your lights off. hehehehehe