It was an E-2 Hawkeye
Twin engine with a smaller version of the AWACS radome on the top of the fuselage. More info here: E-2C Hawkeye
They are a Navy plane so probably Naval Air Station at Whidbey Island. A very cool airplane. I was living in Seattle while the original AWACS were being built and would see them parked by the runway at the Boeing factory - advancing technology makes everything smaller, better, and more geektastic.
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