(CNN) - The Federal Aviation Administration issued an emergency Airworthiness Directive Tuesday mandating operators of at least 80 older Boeing 737s to conduct inspections for wear and tear. The order comes days after a Boeing 737 flown by Southwest Airlines made an emergency landing with a hole in its fuselage. The planes must be inspected every 500 cycles, which are take-offs and landings, until more can be learned about a Friday incident when a Southwest Airlines plane landed with a hole in its fuselage.The FAA mandate affects about 80 U.S.-registered 737-300s, 737-400s and 737-500s, mostly operated by Southwest. Another 95 or so aircraft are registered outside the United States.
How safe are our planes? Do low-cost carriers planes that fly frequent, shorter flights need more maintenance? Today on American Morning Peter Goelz, former National Transportation Safety Board managing director, explains the meaning behind the emergency inspections.