I'm watching the winter follies in progress at MSP. They're getting hit with a big snow storm. Traffic is circling around EAU and this poor little CRJ doesn't know where to go. He's FLG2884 from YYZ to MSP. He's changed his destination from MSP to EAU to LSE in five minutes....which got me thinking.
What happens if an airliner inbound from a non-USA airport is diverted to a USA airport that doesn't have customs/immigration? Are the passengers held somewhere?