• Installing blast-resistant glass in terminal windows

• Adding catch bars to keep those windows from collapsing on people near them

• Adding concrete bollards to keep vehicles away from support beams or doors

• Fortifying support beams with concrete casings

• Building a baggage system that automatically feeds luggage through explosives scanners

• Setting up a remote drop-off point for deliveries

• Constructing parking garages at least 300 feet from the main terminal

• Adding alarms or security cameras to heating and ventilation system rooms

Sources: Dick Marchi, senior adviser with Airports Council International-North America; Andy Bell, vice president of planning at the Dallas/Fort Worth International Airport; and Jay McQueen, deputy project director for the new Indianapolis International Airport terminal