Yes, you can do it in a plane, but its funnier, and easier in a jeep, preferably a humvee because of it's deep back seat. Well, this is how you do it. Be an engineer, pull out your C4, and toss it in the back seat. Drive it to a big group of enemies, or tanks (better boom!). Get out of the jeep/kublewagon, and blow it up. Its really funny when you get out and one of your guys gets in and drives off! Cause' when he gets close to the enemy... Ka-blooey, "I didnt like him anyway."