As the airliner is approaching the Presidential retreat, several shots of the pilot show his epaulet's change back in forth between having four gold stripes, as is typical of airliner Captains, and four stars, which is more typical of Military Flag (General or Admiral) Officers.
Despite the claim, the airport at the beginning is clearly not in Miami. MIA is located in the middle of a tropical city whereas this airport is clearly away from any city, characterized by dry scrub brush, and mountains visible in the distance (no mountains within 500 miles of Miami).
The president's compound in Coral Gables is shown to have a view of downtown Miami. In reality, downtown Miami is not visible as shown from the small bit of shoreline that Coral Gables possesses.