09/30/2024. Remarks by Johan Visschedijk: "After the sole prototype XP-38 Lightning (Model 22-64-01), the USAAC ordered thirteen service test YP-38s (Model 122-62-02), followed by thirty initial production P-38s (Model 222-62-02).

However, a change order to the initial production contract (s/n 40-744 to 40-773, c/n 222-2215 to 222-2244), provided for the completion of the nineteenth P-38 (s/n 40-762, c/n 222-2233) as a prototype with a pressurized cockpit. The aircraft was redesignated XP-38A (Model 622-62-10).

Design work on the XP-38A was done under the direction of project engineer M. Carl Haddon and provided useful experience later incorporated in the XP-49 design. To partly offset the added weight of the cockpit, the 1.46 in (37 mm) cannon was to have been replaced by a 0.787 in (20 mm) weapon but no armament was actually fitted to this experimental aircraft.

Manufacturer's flying trials were done by Joe Towle between May and December 1942 and the XP-38A was accepted by the USAAF at the end of that year. Eventually it was declared surplus and transferred to Bush Field, Augusta, Georgia, where it was scrapped on March 28, 1945."