I brought my parents to the airport last week. When I was heading home, I got on the onramp that brings you on I-10. One of the runways is parallel to this ramp. As I was getting up on the ramp, an airliner was taking off and was in the air parallel to the ramp when I got a laser alert from the Passport. I looked around behind me but I didn't see any cops. I originally thought it was a cop because they used to patrol that airport road all the time. When I didn't see one, I thought maybe something the airliner was using caused a false alert. It looked like an MD-80 but I couldn't see the airline, possibly Delta but not sure.