N1786B graces all 737 models during their first flight
Every plane in the Boeing factory is marked with its registration number – N1786B – so that it is ready to fly when it is completed. But they are all the same registration, something that is rather unusual. Boeing can do this because the planes fly only once with that registration number. The destination of that first flight is the paint shop a few miles away where the fuselage is repainted into the customer’s livery and the new registration number is applied.