Yes but it's hard to see how machine guns prevent somebody having left a 'package' under seat. It's like how after 911 there were tanks at Heathrow airport - in

Yes but it's hard to see how machine guns prevent somebody having left a 'package' under seat. It's like how after 911 there were tanks at Heathrow airport - in case of hijacker on a plane? Or in case the hijackers decide to attack the airport with a wave of T32 ?