The term "ace in a day" is used to designate a pilot who has shot down five or more aircraft in a single day,[1] based on the usual definition of an "ace" as one with five or more aerial victories.
The term "ace in a day" is used to designate a pilot who has shot down five or more aircraft in a single day,[1] based on the usual definition of an "ace" as one with five or more aerial victories.