AIRPORT OF ENTRY is the term used regarding an airport with immigration facilities in most countries. In the US, the term is "customs landing rights airport" is often used.
Boeing Field (BFI) is one such airport.
http://www.airnav.com/airport/KBFI Biggin Hill is too. I have two stamps in my passport from there. Various fields throughout Europe require 4 to 48 hours advance notice.
The comment about the visa waiver is also true.
Intends to travel by private aircraft or other non-signatory air or sea carriers to the United States http://travel.state.gov/visa/temp/wi...hout_1990.html