Figured, and yeah... Air condition in the 40's included huge, impracticle systems which I doubt they could have incorperated into the aircraft, especially the military aircraft. Besides, once they reached cruising altitude, they temperature would be very cold, even in the China/Burma - Pacific region.
As far as the pressurized cabin - they still carried oxygen mask and equiptment because if they took rounds throught he hull, well...there goes their air supply.