XP-59 aircraft testing continued at Muroc for the remainder of 1942 and in 1943. The second XP-59A flew on 15 February 1943 and the third late in April. Shortly before the first flight of the XP-59A, the USAAF had placed an order for one hundred P-59A Airacomets. However, the performance of the XP-59A service test aircraft had proved to be rather disappointing, not even up to the standards of conventional piston-engined fighter aircraft already in service with the USAAF. It was considered rather unlikely that any appreciable improvements in the performance of the P-59 would be soon be forthcoming, and by the early fall of 1943 the Airacomet was no longer considered by the USAAF as being worthy of consideration as an operational combat type.