My suggestion is simple, removing ability to use air vehicles in DM area, in this case seasparrow. Many players are complaining about farming kills and unfairness. Maybe something similar to warning message that was displayed when you enter the AF base air space before would solve the problem. If you don't leave in 10 seconds, you will be killed. As I considered the community's opinion and accepted some suggestions, I think the total restriction of shoot-able vehicles in the DM air space would solve the problem.
