Firewalls are the equivalent of check-in. The passenger name and destination ticket are checked, if they match, the passenger is allowed to continue. Port 80 security devices provide to enterprise networks to the rest of an airport's security arsenal, see table below.
Air Travel Security
Check user and destination
Firewall source/destination check
Security Gateway validate user with authentication system
Check time and date
Security Gateway time/day rules
Security Gateway bandwidth limits
Security Gateway content filtering
Security Gateway virus-scanning
Individual metal detector
Security Gateway scan/block mobile code or specific file/MIME-types
Check visa validity
Security Gateway browser, media-player, messenger application
Sniffer dogs (food, drugs etc.)
Security Gateway: ensure data not POSTed to the web
Frequent flyer awards
Logging by individual user
Specific policies depending on destination
Security Gateway granular policies
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