On Wednesday, a Boeing 787 Dreamliner test plane took off from Seattle for an 18-hour endurance test flight across the US.

While test flights are quite common, what made this unusual was the shape of the flight path.

"Rather than fly in random patterns, the test team got creative, flying a route that outlined a 787-8 in the skies over 22 states," a Boeing spokesman told Business Insider.

The nose of the Dreamliner outline points toward Boeing's home in Washington, its wings stretch from northern Michigan to southern Texas, and the tail reaches Alabama.

This isn't the first time Boeing's test team has gotten creative with a flight route — engineers used a 737 MAX's eight-hour test flight in February to spell out "MAX" across Washington and Montana.