 One of the few remaining complaints with the Merlin-powered aircraft was a poor rearward view.The canopy structure, which was the same as the Allison-engined Mustangs, was made up of flat, framed panels; the pilot gained access, or exited the cockpit by lowering the port side panel and raising the top panel to the right.The canopy could not be opened in flight and tall pilots especially, were hampered by limited headroom.