Douglas XP-48
... that the U.S. Army Air Corps cancelled the Douglas XP-48 because its performance figures seemed to be too good to be true?
... that the <a class="mw-redirect" href="./U.S._Army_Air_Corps" id="mwDfo" rel="mw:WikiLink" title="U.S. Army Air Corps">U.S. Army Air Corps</a> cancelled the <b id="mwDfs"><a href="./Douglas_XP-48" id="mwDfw" rel="mw:WikiLink" title="Douglas XP-48">Douglas XP-48</a></b> because its performance figures seemed to be too good to be true?