First flight of the <a href="https://en.wikipedia.org/wiki/North_American_B-25_Mitchell" id="mw4w" rel="mw:WikiLink" title="North American B-25 Mitchell">B-25 Mitchell</a> <a href="https://en.wikipedia.org/wiki/Medium_bomber" id="mw5A" rel="mw:WikiLink" title="Medium bomber">medium bomber</a>.