My brother started the strategy of building an airport first thing and about 15 transport planes. Then, fly them into an enemy base, pick up the enemy commander, fly him to the most concentrated part of the enemy base and then let the plane hover until it was shot down by the enemy. The commander explosion would take out a lot of the enemy base and of course kill the commander. Usually, when the commander dies, it's game over for the enemy.
It was plain out dirty. When he wanted to be nice, he would just pick up the commander and place him on another part of the map. This strategy never failed. People just got plain pissed when he did it.
I thought it was hilarious and quite clever.