This morning I saw a pure white 747 with no markings of any kind land at the Atlanta airport. No colors, no airline livery, nothing except a small black patch near the cockpit which might have been an FAA number.
It might be a plane that hasn’t been delivered to the buyer yet. Customizing for the buyer (paint etc.) is the last step in Boeing’s manufacturing process. They might be testing the plane or maybe it needed something at that location. It will then get customized and delivered.
Not an answer to your query, but something to ponder.
A couple of years ago Mrs. Duckster and I went to the Museum of Flight at Boeing Field near Seattle. We arrived near lunch so we decided to get a bite to eat at the museum coffee shop. The shop overlooks a main runway. In fact, we were not more than 300 feet off the runway. Small planes were taking off and landing all the time.
All of a sudden a 747 touched down at our end of the runway. It, too, was all white and had no markings on it, similiar to what you just observed. I assume it to be an experimental or test aircraft.
Later in the day we were back in front of the museum about to go through Air Force One parked right next to the taxiway and that same runway. It was then I noticed that same 747 approaching us on the taxiway to prepare for take off. Never having been so close to a 747 at takeoff I decided to stop and watch.
The 747 rolled perhaps 200 feet passed us, turned around and waited for clearance. ( Google Map. ) The 747 received clearance for takeoff and applied full power to the engines. I was preparing to cover my ears from the anticipated jet noise only to discover there wasn’t any! Well, let me rephrase. My wife and I were able to converse in a normal tone of voice and comment on the lack of jet noise as it applied full power and passed in front of us at the begining of takeoff. We continued to watch it roll down the runway and lift off, all the time is relative silence.
A new non-marked 747 with practically no jet noise at take off. You tell me.
Did it have windows for the main cabin? If not, it may have been a cargo plane (like this). It may have been a cargo plane anyway, like this one at Atlanta; they sometimes have less decoration than passenger planes.
I imagine them in fencing gear, with their faces completely hidden by nondescript masks and their voices filtered through what TV shows use to protect the voices of anonymous witnesses. No race, no age, just barely a hint of gender.
“I was gratified to be able to answer promptly, and I did. I said I didn’t know.” – Mark Twain
Hubby works for the Lazy B. He tells me it could be a canceled order that was too far along to dismantle. The company finishes the aircraft, then it’s stored in the desert, until it someone else buys it. The paint scheme is done to the customer’s specs. Therefore the plane you saw may have been in transit to an aircraft paint shop. They have them scattered around the country, maybe not as many as Maaco.