Does the airplane or helicopter currently have insurance?
Sometimes sellers will let their insurance lapse, and the buyer’s insurance won’t become effective until he or she owns the airplane. This can be a real problem if you want to test fly the aircraft. Don’t count on non-owned coverage here, because it will only respond if you are at fault. If you test fly an airplane which has no insurance of its own, and which is damaged as a result of mechanical failure, there will probably be no insurance for anybody, even if you have non-owned physical damage coverage.