Originally posted by pop4 Looked up the rego NI786B, looks like its a Norwegian Air Shuttle Boeing 737-800.
Some additional info - on the same day I went to the Renton airfield and saw THREE additional 737's with the registration N1786B.
It's their internal ferry ID registration.
I didn't think it was ever possible to see two aircraft with the exact same reg'n, but that day I saw FOUR.
It is destined for Continental Airlines. When I get home later I'll post a pic that shows the lower portion of the rudder - it's a dead giveaway.