F18 BRUTALLY Destroying troops in Combat Siege

How F18 are destroying troops in Combat Siege with minimum losses. I have a bunch of F18 aircraft and I am without mercy killing all troops protecting the highways in Combat Siege. F18 aircraft is in my opinion the perfect weapon in Combat Siege in destroying the enemy troops. Especially if you have lots of them. Even anti-air units are in combat siege are almost useless against a large amount of F18