Originally Posted by
747_not_777
Thanks Prospero - my first night in the US is technically on board a 737 with AA routing to MIA. Cancun is merely a daytime joint the following day. Does that alter things?
As you'll need to fill out another darned I-94W visa waiver on arrival in MIA the next day, I'd be inclined to enter "in transit to Cancun" when you first arrive into SFO and the address of your hotel in LAS for immigration in MIA.