Originally Posted by
j2simpso
Interestingly, this trick doesn't work for flights into CAN/USA from outside (or at least my batting average is 0 for 2). So far tried it at LHR to YYZ and was asked to present passport. Similarly today at SIN for my flight to SFO was again asked to present passport.
According to Timatic, nexus is not sufficient, passport is required from outside NA.