Departure Stamps...

[sanjoseaug20]

... probably ... is the keyword. Check this

http://www.cbp.gov/linkhandler/cgov...apis_pre_departure.ctt/apis_pre_departure.pdf

 

[TheRealCanadian]

The manifests are probably requiree fro US bound airline but not foreign bound airline.

DHS doesn't care where the airline is based, if it wants to use US airspace, it needs to provide passenger manifests. Simple as that.