How many pilots were killed in all your sons?

In the film "All My Sons," there is a tragic revelation regarding the fate of the pilots involved in the war. The character Joe Keller is responsible for the production of defective airplane parts that led to the deaths of 21 pilots, including his own son, Larry. This devastating consequence of his actions serves as a central theme of the play, highlighting the moral dilemmas faced by individuals in the pursuit of profit over human life.