The P-4A has never been in service with the Swiss AF, but is shown here due

to the fact that it is directly linked with an important page of Swiss aviation history.

This type of helmet was worn by Bill Lear, Jr. during the test flights of the

P-16 fighter-bomber, developed by FFA "Flugzeug Fabrik Altenrhein".

Due to accidents and political troubles, the project was abandoned, but a part

of it survived, as the airfoil design has been incorporated into the Learjet

aircraft family.