Not seen but heard this past Saturday. I was out in the backyard, the weather was crap
with a very low cloud ceiling and, as usual, I could hear a large jet going over but it wasn't
visible due to the clouds. I'm used to all the Boeing wide-body types flying over the house,
we're in the pattern for Paine Field, and I was thinking "that kinda sounds like a 777, but
not" and I couldn't figure it out. Later I realized, based on timing etc., that it was the 777X
prototype. It sounds different with the new engines.
