Originally Posted by
CXYYZ
An Aeroplan member can buy E+ at check-in. Unfortunately, UA's processes are archaic in that itineraries originating ex-US are not eligible for online check-in, so this reduces the window of availability in buying space in E+ to the time at the airport or at the gate.
Non-U.S. nationals are also unable to upgrade intra-U.S. flights from the United.Com check-in screen because it does not accept foreign credit cards
SG