Hi jongar,
let us know what you think of immigration at IAD - I find it the best US airport in this respect. Even in Y, I can usually be cleared through immigration & customs and sat in my Hertz car within 30-40 minues of pulling up at the stand
[off topic]
If you're going to the Herndon Office, get a good breakfast, the on-site catering is just awful.
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Chris Elvin