Near the end, the plane was going fast enough to get off the ground and flying away from the marshals, who are on foot. The marshals were left far behind, but are at the plane within a couple of seconds of it landing. Unless they could run faster than the 6 Million Dollar man Steve Austin, it would have taken them far longer to get there.
Adam's wife describes his girlfriend as being 5'-10" and 100 pounds. The actress that played the girlfriend, Natalie Quintanilla, is only 5'-7" tall.
Annie implies it is quicker to run a half mile through the woods than to use a car and go 1 mile. Even if a she could run a 4 minute mile (15 MPH), it would take her about 2 minutes. In reality, since she was wearing body armor and carrying equipment, it would take her at least 5 minutes to get there. Since a car can go much faster even on residential or rough roads, it would take far less time to get there in a car. Additionally, she would be severely winded after running that distance, which would reduce her ability to engage a suspect.