Perhaps there should be a further distinction of Boeing "Test Pilots". There are two separate groups of Test Pilots - "Production" and "Experimental". Production test pilots are the ones that take new production aircraft up for their 'shake down' flight(s) - "B1" flight in Boeing lingo - and also go up with the customer pilot(s) when they do their acceptance flight tests. These aircraft are under full production certificates. Experimental test pilots are exactly that - they fly experimental flight tests of uncertified configurations under experimental airworthiness tickets (either new designs, or significant changes to certified designs). There is some crossover between the two groups (and I know of at least one "Experimental" test pilot who was transferred to "Production" test pilot after he did something really stupid during a flight test and nearly lost the aircraft). but for the most part they remain in two separate camps.