America's elite pilots are all shot down, except a single pilot as played by Will Smith. He goes into a dive into a cannon with two Alien ships on his tail. They crash because of poor navigation but, his plane has to set down as well. The human pilot then promptly heads to the crashed Alien ship watches the hatch open and promptly welcomes the Alien to Earth with a swift punch in the face. The alien forces then launch an attack on the Airfields that supplied planes for the recent offensive maneuvers in the skies.
Crewmen run about wildly as green laser blasts scorch the Earth and send debris up into the air.
A computer genuis determines that if a computer virus could be uploaded to the giant Alien ships in the sky then they all would lower their defensive shields as the Alien's technology would be on the fritz. This miracle virus that can transverse operating systems from different worlds, was made on a Mac naturally. In the films dramatic end, pilots are recruited from the citizen survivors on the ground. Apparently more airplanes survived than pilots, this of course is quite illogical but makes for a good story. The film was one more of action than of substance.