Mid-to-late production Corsairs incorporated a new, taller, wider canopy with only two frames — very close to what the Malcolm hood did for British fighter aircraft — along with a simplified windscreen; the new canopy design implied that the semi-elliptical turtledeck "flank" windows could be omitted. The designation F4U-1A to differentiate these Corsairs from earlier "birdcage" variants was allowed to be used internally by manufacturers. The pilot's seat was raised which, combined with the new canopy and a lengthening of the tailwheel strut, allowed the pilot better visibility over the long nose. In addition to these changes, the bombing window under the cockpit was omitted. These Corsairs introduced a -long stall strip just outboard of the gun ports on the right wing leading edge and improved undercarriage oleo struts which eliminated bouncing on landing, making these the first truly "carrier capable" F4Us.