> by parachute ... > wind or rain Obviously parachute delivery is more sensitive to weather conditions. Parachutes would need active guidance to be at all pr

> by parachute ... > wind or rain Obviously parachute delivery is more sensitive to weather conditions. Parachutes would need active guidance to be at all practical. If the parachutes and guidance systems aren't recoverable (collected from your mailbox, maybe?) that'll add to delivery costs.