Peter,
I bought the aircraft in a military museum somewhere in Connecticut. I have the instruction sheet from one of the models in front of me. They are called In-Air, E-Z Build, registered trade marks of Plymouth Toy and Book, 103 Panton Road, Vergennes, VT 05491. They appear to made for PT&B in China by a company called New Ray (
www.new-ray.com). Apart from the 2 planes you saw, they definitely also make a Sopwith Camel and a Fokker Triplane. Happy Hunting.
Perhaps everyone else should be hunting for anti-aircraft guns.
All the best,
Colin