My great aunt on my mother's side emigrated to the USA, and ended up living in Seattle.
My mum went to live with her for a year in the late 50s, she was also considering emigrating at the time, but got homesick and eventually returned to the UK.
She remembers seeing the 707s overhead, they were test flying them over Lake Washington. The original spec 707s had already begun servive at that point, I believe the planes she saw on test flights were one of the subsequent variants.
Totally unrelated to planes, she also learned to waterski on Lake Washington.