[DanBC]

Do you drive to the airport?

EDIT: Driving to the airport will expose you to far more risk than walking through the machine, however you define that risk.

[JshWright]

A significant benefit is derived from driving. No such benefit exists from AIT scanning.

[rbcgerard]

What is you confidence level regarding the maintenance and calibration of these machines?

[DanBC]

I have no idea. I do know that driving is far more dangerous how ever you define danger.