The second Boeing  787-9 Dreamliner completed a successful 4-hour, 18-minute first flight today. The airplane, known as ZB002, departed Paine Field in Everett, Wash., at 8:06 a.m. and landed at 12:24 p.m. local time at Seattle’s Boeing Field.

As the only 787-9 test airplane to be fitted with elements of the passenger interior, ZB002 will test systems such as the environmental control system in addition to avionics and other aspects of airplane performance. Boeing has conducted a series of ground tests on the second 787-9 since its completion in late September.

With manufacturing of the 787-9 flight-test fleet complete, the first production 787-9 in final assembly and 137 flight-test hours to date, 787-9 development is on track. 787-10 development also is progressing as planned.

First delivery of the 787-9 to launch customer Air New Zealand is set for mid-2014. Twenty-six customers have ordered 396 787-9s, accounting for 40 percent of all 787 orders.

Boeing press release