You can still fill out the green form at the airport, pre-authorisation is not mandatory as yet. I did the online pre-auth for a recent trip to the US but when I went to the airport they asked for the green form anyway and didn't seem to know what I was talking about when I said I had online preapproval ....
US authorities asked for the form on the other side too and the Immigration official said the online preapproval was 'trialling' at the mo.
US authorities asked for the form on the other side too and the Immigration official said the online preapproval was 'trialling' at the mo.