US Homeland Computers are down...PreClearance is also a problem
The computers used by US Homeland Security for processing immigration seem to have gone down and causing chaos at US airports for international arriving passengers and at Canadian (and other countries') airports with PreClearance. So if you have flights to the US tomorrow morning, get to the airport extra early...even with Global Entry or NEXUS...and fill out a card just in case if you still have any.
http://www.cnn.com/2017/01/02/americ...age/index.html