Substantially more complex than previous aircraft, the new plane required the pilot to attend to the four engines, a retractable landing gear, new wing flaps, electric trim tabs that needed adjustment to maintain control at different airspeeds, and constant-speed propellers whose pitch had to be regulated with hydraulic controls, among other features.

NEWYORKER: The Checklist

The Park Place search begins a day after the NYPD announced that Boeing officials had determined that the 5-foot-tall, 3-foot-wide wreckage is a support piece attached to the wing of an aircraft, and not a piece of landing gear as originally believed.

WSJ: 9/11 Remains Sought in Debris Behind New York City Building

In terms of design, the A400M has a classic high wing configuration, fuselage with ramp and large rear door, high flotation retractable landing gear and "T" tail.

BBC: A400M: Military workhorse